Comparison: Budget LED Light Bulbs

50 posts / 0 new
Last post

Pages

keltex78
keltex78's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 03/18/2011 - 10:15
Posts: 3705
Location: Texas
Comparison: Budget LED Light Bulbs

Over the past few months, I've been picking up the odd budget LED light bulbs via different sources.

From left-to-right: Standard 14W (60W equiv.)CFL bulb, eBay purchased 6W LED bulb, MF purchased 4W warm bulb in GU10 base and E27 bases, MF-purchased 3W warm bulb, DX purchased cool SMD bulb, and eBay purchased cool bulb.

A bit about each bulb:

eBay purchased 6W LED bulb: I purchased a pair of these bulbs. They are rated 6W. They each contain 22 warm white 5050 SMDs. They give a light that is slightly green, but not unpleasantly so. When looking at the emitters directly, you notice a bit of 60Hz flicker, but it's not normally noticed in the room. On one of the bulbs I purchased, half of the emitters cut out when the bulb gets warm. I disassembled the bulb, and found that there are two circuits of series-connected LEDs driven from the same output on the driver. Apparently, there is a bad component in one of these circuits. I haven't found any bad traces/solder joints. I am currently using these bulbs for porch lights, and they work well for that, with the exception of the defective bulb.

 

Manafont purchased 4W bulbs in GU10 and E27 base (http://www.manafont.com/product_info.php/gu10-41w-4w-360lumen-warm-white... and http://www.manafont.com/product_info.php/e27-41w-4w-360lumen-warm-white-led-light-bulb-85v265v-ac-p-6416):

These are essentially the same bulbs, only with different bases. They are rated at 4W, and each has 4 warm-white emitters and a TIR optic designed for a five-emitter lamp. These seem to be rather well built, and the aluminum heat sinks do a very good job of transferring heat away from the emitters. These emit a very pleasing tint of light, focused in a beam too narrow for room illumination, but well suited for spot and accent lighting. Unfortunately, I dropped one of these bulbs on the floor, and it wouldn't light afterward. I disassembled the bulb and noted a single surface-mount capacitor missing. I felt it fall through my fingers, but was never able to find the component to repair this bulb. I am very happy with these lamps and would recommend them to anyone who needs a cool-running, high-efficiency spot/accent type lamp. I have had four of these bulbs in a kitchen light fixture where they have been used for two months now with no failures or issues. Here is one disassembled showing the construction:

Manafont-purchased 3W bulb (http://www.manafont.com/product_info.php/e27-31w-3w-270lumen-warm-white-light-bulb-lamp-silver-85v265v-ac-p-7145):

I purchased two of these bulbs from Manafont. They are labled as 'Uniquefire'. They emit a pleasant tint of light, but are only bright enough for a desk lamp for very basic illumination. If I were using it as a work lamp at a desk, it would not be enough light for detailed work. Of the two bulbs I received, one was well assembled, while the second did not have the LED assembly secured to the heat sink. It is supposed to be glued with a gray 'Fujik'-type of compound, but it was not attached. The diffuser results in a wider area of light, but it's still too directional to use in a tabletop lamp with a shade. I wouldn't recommend these lights unless it suited a particular application you have in mind and are willing to double-check your bulbs.

 

DX cool-white SMD bulb (http://www.dealextreme.com/p/e27-3w-18-smd-5050-led-white-light-bulb-110v-47795):

I purchased three of these cool-white bulbs from DX. They each have 18 5050 SMDs and are rated at three watts. These lights are very dim. They have a very cool tint with a wide area of illumination, but are too dim for general use. Even when used in a desk lamp, they do not have sufficient brightness to properly illuminate a work area. I am currently using them in a ceiling fan fixture in my computer room where they provide enough light to navigate within the room, but not enough to actually do any work. These would possibly be well suited for accent lighting in a home theater type of room as they emit such a soft and subdued light.

The eBay Special:

I purchased a pair of these lights from a HK dealer on eBay. They were listed for $1 each with ~$4 shipping. I accidentally purchased them in an E14 base, so I was then forced to purchase a pair of E14-to-E27 adaptors which was rather dissappointing. They each have 108 cool-white emitters. These lights are quite easily the worst of the lot. Even though I purchased the pair together, they were shipped separately, and each bulb was labled differently. One was labled as AC230V-50Hz @ 5W while the second is listed as AC110-240V 50-60Hz @ 3W, but both bulbs emit the same amount of light when used. These lights are EXTREMELY dim and are essentially worthless for any application I can think of.


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

Edited by: sb56637 on 09/02/2017 - 12:44
keltex78
keltex78's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 03/18/2011 - 10:15
Posts: 3705
Location: Texas

Here are some light-comparison shots. The first shot is a control shot using the CFL bulb, with manual settings on the camera and white balance set using this bulb. All subsequent shots were made with the same settings. The green/blue tints are not NEARLY as noticeable through the eye; these shots show the tint as exagerated by the white balance setting of the camera. The do however show the overall brightness levels of these bulbs.

  • Standard 14W (60W equiv.)CFL bulb
  • eBay purchased 6W LED bulb
  • MF purchased 4W warm bulb in GU10 base and E27 bases
  • MF-purchased 3W warm bulb
  • DX purchased cool SMD bulb
  • eBay 'special'

CFL - control shot

 

4X LED spot

 

3x warm

 

5050 SMD

 

ebay special


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

df2dot
Offline
Last seen: 9 months 4 days ago
Joined: 02/15/2011 - 14:15
Posts: 520

patiently , sooooo patiently

 

EDIT: WELL THAT WAS WORTH the wait . very nice pics n review

frankly the tech is limited by the form factor of the E27,  id love a step by step tutorial with common parts. even if it doesnt fit in a regular socket. 

 

agenthex
agenthex's picture
Offline
Last seen: 7 years 2 months ago
Joined: 07/14/2010 - 04:49
Posts: 3070
Location: Merica

keltex, do you feel that 5050's are in general a decent solution for desk lamps? I'm thinking of getting a bulb for desklamp that I have which uses illumination from one side of the bulb (so an axially symetrical design wouldn't work), and wonder if they sting the eyes if looked into directly, etc, all the little things that can't think of without actually using one.

Something like: http://cgi.ebay.com/E27-44SMD-5050-LED-11W-PL-Light-Lamp-Warm-White-85-2...

 

Thanks.

Reading this makes you smarter: http://lesswrong.com/

keltex78
keltex78's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 03/18/2011 - 10:15
Posts: 3705
Location: Texas

The 5050 emitters are definitely blinding when you look directly at the emitters. Here's a side emitting bulb available on Manafont that may be suited to your desk lamp; the first is a 5W and the second is a 8W:

http://www.manafont.com/product_info.php/e27-51w-450lumen-white-light-85v265v-ac-p-7152

http://www.manafont.com/product_info.php/e27-81w-720lumen-white-light-85v265v-ac-p-7153

I can't recommend either of these bulbs as I don't own them, but I like the fact that they have a diffuser to soften the light.


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

agenthex
agenthex's picture
Offline
Last seen: 7 years 2 months ago
Joined: 07/14/2010 - 04:49
Posts: 3070
Location: Merica

I wonder what's inside those. The specs seem a bit bare since it doesn't reference emitters or temp. I assume it's cool white since it doesn't say "yellow".

Reading this makes you smarter: http://lesswrong.com/

okyeung
okyeung's picture
Offline
Last seen: 5 years 1 month ago
Joined: 05/03/2011 - 00:03
Posts: 377
Location: northern california

Thanks for the review.  Look like CFL still has the edge for now.

3

sb56637
sb56637's picture
Offline
Last seen: 5 hours 14 min ago
Joined: 01/08/2010 - 09:29
Posts: 6901
Location: The Light

Hi there keltex, thanks very much for this informative comparison! I've been waiting for somebody to post such a comparison, because I want to get into LED light bulbs. Very well done, thanks for the comparison shots. Frontpage'd and Sticky'd.

So far, it looks like many LED bulbs might not meet my needs. I prefer a very warm colored, very bright 100W equivalent. And I need pure flood, like a regular incandescent bulb provides. I currently use 26W CFLs rated at 1700 lumens by GE, which I like very much. But I'd obviously like to drastically reduce the power usage if possible, since electricity is extremely expensive where I live.

Budget Light Forum ...where Frugal meets with Flashlight!

agenthex
agenthex's picture
Offline
Last seen: 7 years 2 months ago
Joined: 07/14/2010 - 04:49
Posts: 3070
Location: Merica

A 100W equivalent bulb is going to be ~20W equivalent in led's, or 2-3 xml's, though you can get away w/ less in led's if directional application is applicable. I supposed you can ask for a warm white version of the 3 xml skyray. Ceiling bouncing that thing is like turning on 150w bulb.

Reading this makes you smarter: http://lesswrong.com/

sb56637
sb56637's picture
Offline
Last seen: 5 hours 14 min ago
Joined: 01/08/2010 - 09:29
Posts: 6901
Location: The Light

agenthex wrote:

A 100W equivalent bulb is going to be ~20W equivalent in led's, or 2-3 xml's, though you can get away w/ less in led's if directional application is applicable. I supposed you can ask for a warm white version of the 3 xml skyray. Ceiling bouncing that thing is like turning on 150w bulb.

I guess I wouldn't save much on electricity then. 26W for my 100W equivalent CFLs.

Budget Light Forum ...where Frugal meets with Flashlight!

agenthex
agenthex's picture
Offline
Last seen: 7 years 2 months ago
Joined: 07/14/2010 - 04:49
Posts: 3070
Location: Merica

Yeah, CFL is actually really efficient. Less flexible packaging than Led's, so they're really more complementary technologies for now.

Reading this makes you smarter: http://lesswrong.com/

Langcjl
Langcjl's picture
Offline
Last seen: 2 years 9 months ago
Joined: 03/05/2011 - 05:36
Posts: 2162
Location: Wisconsin USA
Nice review!

Piers said " ....but who wants enough light, when you have the option for far too much "

Davx
Davx's picture
Offline
Last seen: 4 years 10 months ago
Joined: 03/17/2011 - 20:29
Posts: 910
Location: Italy

Thanks for the review! I'm searching for a led bulb and this comparison is really helpful!

"There are always new jobs, women, and apartments......there is only ONE BLF." - Chicago X (27/03/2012)

SirJohn
SirJohn's picture
Offline
Last seen: 7 years 5 months ago
Joined: 09/28/2010 - 10:12
Posts: 479

Hugely useful post and review. Thanks so much. Sounds like many of the LED lightbulbs still fall a little short for now.

It does however, tempt me to stop at Menard's this weekend and pick up one of these on sale:

http://menards.inserts2online.com/breakout.jsp?referrer=imagemap&imageName=b781123_19.jpg&isBreakoutImage=true&pageNumber=14&breakoutName=b781123_19.jpg&itemId=&showAsPage=true

brjones
Offline
Last seen: 2 years 4 months ago
Joined: 02/03/2011 - 01:58
Posts: 322
Location: USA

Thanks4OP. Pretty much confirms what I suspect every time I see "4 watts" -- common sense will tell you it'll be as or probably less bright than one of those cheap 3 x AA "3 watt" headlamps with no-name emitters. Any decent LED bulb will need to be, what, 10 watts min, pref 17+.

 

DX has some interesting high-wattage large-surface bare LED's, like 20+ watts. They seem easy enough to hook to a computer heat sink and power with a regular DC power supply. However I've not seen anyone do that, just people torture-testing Cree's is as close as I see on that. No idea why we don't see these at market as a finished product? Even in wal-mart now I see these 4-watt pieces of shame. That's not acting in good faith in my opinion, as 4 watts by any means is not going to be much more than a night-light.

 

I think maybe we see Match's next project? The [multi?] XM-L "X-Lamp Lamp'? Seriously, how much would a well-made single Cree XM-L semi-directional/lower output light bulb really cost? I think going from AC to DC would be the hardest part, even beyond heatsinking? An XM-L die wholesale costs maybe, what--$5 wholesale or less? KD has 'em on a star for $8 shipped.

 

At this point the demand is so high and supply so low, yet bare parts available, I think someone could make at least decent side money cobbling such things together by hand, possibly a living like Nailbende, selling them on Ebay, shows/conventions, FORUMS, etc..

 

Some of the "higher" wattage ones at Wal-Mart (like 8? LOL) seem to have fans in them! I'm not sure, it's hard to tell. But I am NOT going to buy a bulb which makes noise of its own! Which is why I won't buy CFL--not (necessarily) audible noise (that too, sometimes), but they produce just TONS of electromagnetic garbage/noise. In fact that's how they produce the light in the first place. Put a handheld AM radio up near a CF bulb when they're both on and you'll hear the sound of death.

 

I'm really hoping that CF will be the "Windows Vista" of lighting technology: touted as the greatest next technology, horrible but some will love it just because it's supposedly great, only around for a short time, and in the end, not a replacement for the older technology... Replaced by something less bad, yet not a complete replacement solution for the old technology. LED will probably be the "Windows 7" of light: what CFL was always supposed to be but never was, still bloated (LED's are ridiculous expensive on the front end compared to incan), not great (LED's have a hard time producing the riciculous light an incan can), but not the bad dream the last "leapfrog" technology was. CFL's will hopefully be analagous to the zeppelins of the past: not the first flying technology, and replaced by simply better versions of a previously-developed technology.

 

So much energy and resources go into CFL's, some argue that they are not a net energy saver over their lifetime. Esp if they break a lot sooner than advertised, which is my own experience. That's why they cost so much: much more energy and environmental cost goes into producing them, vs incan's which are very lean on resources used. Same reason hybrids cost more than a comparable vehicle. To save $5 to $15 on electricity, that bulb will need to be used a lot, and last a long time.

 

Plus, CFL's can be very dangerous, and fail catastrophically at unpredictable moments. Had it happen to me, and have read worse stories of them breaking unexpectedly and spewing fiery plasma until turned off (not to mention the mercury). Just 1 whole-room carpet replacement for spilled mercury covers enough resources for a lot of incan light bulbs and electricity to power them for a LONG time. I now won't leave the home with a CFL running.

 

Personally, I'm stocking up on 100-watt incandescent light bulbs (30 cents apiece!) as in the USA, national socialists are trying to ban them. If nothing replaces CFL, I'll have to be a renegade and get DX to try to sneak my contraband incans past customs. Maybe I'll be arrested on a streetcorner trying to buy 100 grams of incandescents, or get my car towed when they find a few during another surrepetitious search. A woman can 'choose' to have an abhortion [sic] on demand and kll her own healthy, consensually-generated human offspring, but it's not our 'right' to 'choose' which light bulb we use? Wake up, this is the wisdom and ethics of Leftism.

 

From the looks of this Comparison, it unfortunately looks like LED replacement for incans is quite aways away.

- Circumcision, regardless gender, by definition causes sensation loss, and thereby usually causes difficulty later in life. Oppose amputation of children's genitals. ALL children. http://tinyurl.com/haszs6o

Huge
Huge's picture
Offline
Last seen: 9 years 5 days ago
Joined: 02/12/2011 - 01:14
Posts: 115

thanks for sharing so patient, glad to here that especially for the different channels of getting them. pictures shows there is just for testing or have any ideas of creating the atmosphere...,Smile

Flashlight may bring me a sunshine~

agenthex
agenthex's picture
Offline
Last seen: 7 years 2 months ago
Joined: 07/14/2010 - 04:49
Posts: 3070
Location: Merica

Plus, CFL's can be very dangerous, and fail catastrophically at unpredictable moments. Had it happen to me, and have read worse stories of them breaking unexpectedly and spewing fiery plasma until turned off (not to mention the mercury). Just 1 whole-room carpet replacement for spilled mercury covers enough resources for a lot of incan light bulbs and electricity to power them for a LONG time. I now won't leave the home with a CFL running.

Uh, the reason they can create that plasma is due to vacuum in the tube, and the trace amounts of mercury they contain aren't even enough to alarm those communist socialists in the EPA. http://www.epa.gov/cfl/cflcleanup.html

Reading this makes you smarter: http://lesswrong.com/

asot
Offline
Last seen: 2 days 6 hours ago
Joined: 12/14/2010 - 16:07
Posts: 338
Location: Greece

Thanks a lot

 

It's definitely a help, since a lot of us were/are thinking in using these bulbs!

CheapThrills
CheapThrills's picture
Offline
Last seen: 1 month 3 days ago
Joined: 07/02/2011 - 10:45
Posts: 3645
Location: Suomi

agenthex wrote:

Plus, CFL's can be very dangerous, and fail catastrophically at unpredictable moments. Had it happen to me, and have read worse stories of them breaking unexpectedly and spewing fiery plasma until turned off (not to mention the mercury). Just 1 whole-room carpet replacement for spilled mercury covers enough resources for a lot of incan light bulbs and electricity to power them for a LONG time. I now won't leave the home with a CFL running.

Uh, the reason they can create that plasma is due to vacuum in the tube, and the trace amounts of mercury they contain aren't even enough to alarm those communist socialists in the EPA. http://www.epa.gov/cfl/cflcleanup.html

 

Have you noticed:

 

Now, that incans get banned people are getting VERY concerned about CFL´s containing mercury.

Have any of you noticed any debate before this? I mean, like 95% (at least at here) of schools, daycares, hospitals, libraries, stores, supermarkets, offices have had CFL-tubes as main source of light for how long, from 70´s?

Nobody at least in here has bothered to take sweat to get these banned for last 40yrs...

 

Ok, CFL´s have mercury. If I remember correctly, it was some 5-6mg tops.

If a bulb breaks, how can you assure yourself, you can get it all into your system? You have to be under it with mouth open and inhale fast & keep it there to maximise dosage.

After succesfully absorbing it, you may have gotten a part of this 5-6mg to your body.

 

 

BTW, do you eat fish?

Have you ever been worried about the amount of mercury in fish meat?

A couple of times in a week was enough to get you almost the same as from one CFL if you eat fish, that has the highest approved limit for consumption. Correct me if I remember incorrectly.

agenthex
agenthex's picture
Offline
Last seen: 7 years 2 months ago
Joined: 07/14/2010 - 04:49
Posts: 3070
Location: Merica

Yes, a lot people are good with names and bad with numbers/quantity. Not a problem if you're careful but sometime it's used to their detriment in propaganda.

Reading this makes you smarter: http://lesswrong.com/

keltex78
keltex78's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 03/18/2011 - 10:15
Posts: 3705
Location: Texas

I wasn't meaning for this thread to turn into an Obama-light-bashing post!

I'm not a fan of the legislation banning standard incan lights, but I still prefer CFLs. I had adopted CFLs long before the impending ban was ever mentioned. I vastly prefer the cooler operation of the CFLs. In NE Texas,  it has been 100+ degrees almost every day for the past month, and we are continuing to experince these high temperatures. Running a incan lights adds a large amount of heat which will then need to be removed by running the air conditioning longer. Also, I don't like the heat that radiates directly from an incan bulb when you are working near it; the CFLs are much more comfortable to work around.

I have also had very good luck with the CFLs lasting much longer than incandescent bulbs. I am using bulbs that I have had for years, and I have carried with me from a house I lived in 5 years ago.

As a bonus, I have located my power meter (a Kill-A-WattEZ) and will be testing these LED bulbs to compare the rated power usage vs the actual measured usage. I'll post the results here when I have them available.


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

imigyjunia
imigyjunia's picture
Offline
Last seen: 9 years 5 months ago
Joined: 08/04/2011 - 23:27
Posts: 1
Location: Shanghai

Good comparison. It would be a great guide when we make new purchase.

heinzeins
heinzeins's picture
Offline
Last seen: 6 years 1 month ago
Joined: 09/19/2010 - 02:04
Posts: 75
Location: Franconia

Thanks for this great review!

I was about to order some for testing but I will wait for better bulbs and/or go for some more expensive.

Pitoar
Pitoar's picture
Offline
Last seen: 7 years 11 months ago
Joined: 07/13/2011 - 23:23
Posts: 18

heinzeins wrote:

Thanks for this great review!

I was about to order some for testing but I will wait for better bulbs and/or go for some more expensive.

Hey you stole my thunder LOL

To be best myself

keltex78
keltex78's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 03/18/2011 - 10:15
Posts: 3705
Location: Texas

An update!

About six months later, one of my MF-purchased GU10 bulbs has failed. The issues appears to have been a bad connection or failed LED on the LED board. As I originally mentioned, I had broken one of the drivers on one of the E27 bulbs. I had retained this bulb for parts, allowing me to removed the LED board and used it to replace the one on the failed GU10 bulb and it worked perfectly once again!


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

vēer
vēer's picture
Offline
Last seen: 1 month 1 week ago
Joined: 01/07/2012 - 14:23
Posts: 2838
Location: N Europe

Can you please post real life pictures how well the room is lit up using this bulb, otherwise your post might be considered as spam.

woundedeagle
woundedeagle's picture
Offline
Last seen: 7 years 11 months ago
Joined: 01/26/2013 - 02:47
Posts: 3
Location: Guangdong,China

agenthex wrote:

keltex, do you feel that 5050's are in general a decent solution for desk lamps? I'm thinking of getting a bulb for desklamp that I have which uses illumination from one side of the bulb (so an axially symetrical design wouldn't work), and wonder if they sting the eyes if looked into directly, etc, all the little things that can't think of without actually using one.

Something like: http://cgi.ebay.com/E27-44SMD-5050-LED-11W-PL-Light-Lamp-Warm-White-85-2...

 

Thanks.

no matter 5050,3014 or 5630 LEDs, the LED brighting is too strong for reading, it's better to install a diffuser on your LED lamps so as to have soft light for reading.

By the way, the lamp shown in your link have 44 pcs 5050 LEDs, let's caculate 1 pcs of 5050 LED has luminous of 18 Lm, then 18 x 44 = 792 Lm, this brightness is closed to that of 100W incandescent bulb, do you really need so much light for reading?

We just concentrate on LED lighting,http://www.ledtech-optotronic.com

keltex78
keltex78's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 03/18/2011 - 10:15
Posts: 3705
Location: Texas

woundedeagle wrote:
By the way, the lamp shown in your link have 44 pcs 5050 LEDs, let's caculate 1 pcs of 5050 LED has luminous of 18 Lm, then 18 x 44 = 792 Lm, this brightness is closed to that of 100W incandescent bulb, do you really need so much light for reading?

I'm surprised anyone is still reading this thread!

First, to answer Woundedeagle, (if he shows up again):

I had two bulbs, each with 22 5050 emitters; these bulbs were not exceptionally bright, and one failed pretty quickly. The second one still works fine. These bulbs are rather dim and I would estimate the light output to be equivilent to a <20W incandescent bulb. Also, my limited research indicates that a 100W incandescent bulb is closer to 1700 lumens; many times brighter than any of the LED bulbs I have ever tried.

Just as a general update: The 109LED corn lights were pathetic, so I stopped using them. I had them allocated for porch light duty, but they were far to dim for that. One finally began failing after a very short while (sections of LEDs would start to flicker) and after I moved, I never unboxed these.

The Manfont 4W bulbs have been great, for the most part. I had purchased several of these for myself, as well as several to replace the expensive and high-failure-rate halogen bulbs used in the stove vent-a-hood for a family member. These bulbs have been rather reliable but with a few failures due to individual emitters failing, possibly due to poor heat sink contact. The metal base of the emitter isn't soldered to the plate, but rather sits loosly on the plate with a small amount of heat sink paste underneath. As these fail, I'm replacing the defective emitters and applying Fujik in an attempt to improve heat transfer. I was able to buy a bag of 10 replacement warm-tint 1W egg-yolk emitters very cheaply from eBay, and installing the replacement is extremely easy. I have enough spare emitters now to last for years...


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

texaspyro
Offline
Last seen: 1 year 6 months ago
Joined: 04/29/2011 - 12:43
Posts: 4593
keltex78 wrote:
Also, my limited research indicates that a 100W incandescent bulb is closer to 1700 lumens

10 lumens per watt is a much more realistic number for the effective output of an incandescnt bulb.

djozz
djozz's picture
Offline
Last seen: 1 hour 52 min ago
Joined: 09/07/2012 - 17:04
Posts: 17463
Location: Amsterdam

This thread is all about very cheap led-bulbs, just thought it was fair to join in with an experience with a quite expensive one, I bought it half a year ago for I think it was 30 dollars at the time, a GU10 reflector bulb replacement:

 

Output is similar to a 50W halogen, beam is better than most halogen lamps, tint is really pleasant (got the ww version). Gets too hot to touch when running longer periods, but it has not failed yet, with at least 4 hours of use every day.

When opened up you can see 4 XP-E emitters on a board screwed onto an alu heatsink that is one big piece forming most of the body of the lamp, the light is colected by 4 TIR's that are frosted on the outside, all looks like a good design:

lesliemorris85
lesliemorris85's picture
Offline
Last seen: 7 years 10 months ago
Joined: 12/12/2012 - 22:44
Posts: 21
Location: Dallas, Texas

Isn’t it amazing how in just over a year technology could change so fast? Now if only prices could catch up, that’s the only factor that’s keeping me off LEDs lol. But perhaps a review of the current, expensive LEDs should be done too just to even it out, not just those from ebay as they’re mostly cheap knock-offs? I would suggest reviewing from different parts of the world such as http://www.ikea.com, http://www.ledlightsmart.co.uk/, http://www.ledcentral.com.au/, and http://www.illustralighting.com.

I know it could be quite an expensive review for one person, so how about those who already have lights from these manufacturers post theirs here and we also agree to some standards for the tests? Smile

Pages