Review: 10W Cool White LED Floodlight from Wallbuys

86 posts / 0 new
Last post
relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada
texaspyro wrote:
relic38 wrote:
Actual heat generated by the emitters would be dependent on the Vf. I’m assuming if current is the same, the pair of emitters would have a lower Vf. Therefore, the pair driven at 1.5A each would generate less heat (and more lumens) than the single emitter at 3A. The difference is relatively minor, but probably measurable.

No, the power in and dissipated as heat would be the same (assuming the driver power loss is also included). Say the batteries were at 4.0V: 4V * 3A is the same as 4v * (1.5A + 1.5A).


True, if I was referring to total power in. I was only referring to emitter power dissipation. That was the specific question asked, as any driver power dissipation didn’t seem to be part of the question.

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

comfychair
comfychair's picture
Offline
Last seen: 9 months 3 weeks ago
Joined: 01/12/2013 - 05:39
Posts: 6187

So waste heat scales 1:1 with input power even though light output doesn't?

relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada

For the emitter itself, the heat/light ratio increases as total emitter power increases. LEDs are less efficient as the drive current increases.

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

FlashPilot
FlashPilot's picture
Offline
Last seen: 12 hours 57 min ago
Joined: 05/10/2010 - 16:07
Posts: 4283
Location: USA

Assuming an external constant power supply, does anyone know if the ratio of heat output (measured at the thermal pads or mcpcb) to input power is linear with XML? I couldnt find anything to illustrate this in the cree datasheets. I dont care about relative fux ratios.

Hypothetically:
If the emitter outputs 2000 btu at 2A, will it output 3000 btu at 3A? I suspect it will output more than 3000, but its just a hunch from all the mods Ive experimented with. For instance, moderately warm running flashlights driven at 2.5A seems to suddenly run HOT when running at 3A. Im fairly certain this isnt just my perception, but I could be wrong.

texaspyro
Offline
Last seen: 6 months 22 hours ago
Joined: 04/29/2011 - 12:43
Posts: 4558

Watts is watts… so the amount of power dissipated will scale with current. But, heat radiates proportionally to the FOURTH power of the temperature difference.

relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada

Pyro makes a very valid point, but I do not think it addresses the question being asked.
Because VF rises with input current, the resulting power dissipation is not linear.
A hypothetical example:
If = 1A, Vf = 2.9V, P = 2.9W
If = 2A, Vf = 3.1V, P = 6.2W
If = 3A, Vf = 3.3V, P = 9.9W
As you can see, power increased in a non-linear way.

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

texaspyro
Offline
Last seen: 6 months 22 hours ago
Joined: 04/29/2011 - 12:43
Posts: 4558
relic38 wrote:
Pyro makes a very valid point, but I do not think it addresses the question being asked. Because VF rises with input current, the resulting power dissipation is not linear.

Again, since the driver is in the box, you have to allow for its’ dissipation also. Total power you have to shed is volts in * amps in.

relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada

The driver’s in a separate box at the back, barely thermally connected to the main chassis. The driver will have its own thermal issues, because of how it’s installed (check my review and mod above to see why).

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

comfychair
comfychair's picture
Offline
Last seen: 9 months 3 weeks ago
Joined: 01/12/2013 - 05:39
Posts: 6187

As a purely theoretical/non-10w-floodlight question, the LED converts input power into one of two things: waste heat or photons. So what I'm getting at is if you hit the point where efficiency starts falling off from the peak, doesn't less lumens mean more of that power is turned into waste heat instead? Like if you had a graph showing all 3, wouldn't the lumens & heat curves start to diverge after a certain point?

Werner
Werner's picture
Offline
Last seen: 1 month 1 week ago
Joined: 10/19/2012 - 15:00
Posts: 3662
Location: Germany

That’s what I said…

BIGWOOD
BIGWOOD's picture
Offline
Last seen: 1 month 4 days ago
Joined: 11/17/2011 - 16:16
Posts: 694
Location: Vancouver, BC

I have one of those 500W halogen floods that burnt-out or dropped too many times, can't remember.  Anyways it doesn't work anymore so in goes the 20W LED from ebay.

 

My main hobby is woodworking and one of my pet peeves is not being able to see properly when I'm spray finishing.  I need a raking light, which is a light that shines towards or from the side at a low angle to the surface you're working on.  I need to see the finish hitting the surface so I can compensate the speed or height of the nozzle.  Nothing worst than spraying blind.  Anyways I purchase many flood light fixtures and stands in the past but never satisfied with them.  Either they are too bright/intense, runs too hot, or not easily adjustable to the height I need.

So when in doubt, build you own.  This is what I came up with.  Some scrap metal shelving supports and metal framing braces/sheet metal cut to size for brakets.  3 x 10W LEDs.  Height can be adjusted between 4 to 6 feet.  Ain't pretty but 100% functional~!

 

 

 

comfychair
comfychair's picture
Offline
Last seen: 9 months 3 weeks ago
Joined: 01/12/2013 - 05:39
Posts: 6187

Does the silver metal thing where a reflector would normally be actually do anything useful?

texaspyro
Offline
Last seen: 6 months 22 hours ago
Joined: 04/29/2011 - 12:43
Posts: 4558
comfychair wrote:

Does the silver metal thing where a reflector would normally be actually do anything useful?

On the ones that I tested, you lose around 35% of the light without it…

Werner
Werner's picture
Offline
Last seen: 1 month 1 week ago
Joined: 10/19/2012 - 15:00
Posts: 3662
Location: Germany
comfychair wrote:

Does the silver metal thing where a reflector would normally be actually do anything useful?

it holds the emmitter in place, its screwed down and gives a nice firm press to the LED…

FlashPilot
FlashPilot's picture
Offline
Last seen: 12 hours 57 min ago
Joined: 05/10/2010 - 16:07
Posts: 4283
Location: USA

I just scored 10 X 10W warm white emitters for less than $10 on ebay to replace my cold white ones. Not a bad deal. :bigsmile:

relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada

Good stuff! Was it a Buy it Now? Link?

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

FlashPilot
FlashPilot's picture
Offline
Last seen: 12 hours 57 min ago
Joined: 05/10/2010 - 16:07
Posts: 4283
Location: USA

Here’s the same seller with a “buy it now” option, but I bid on the ones I won.

http://www.ebay.com/itm/10-X-NEW-10W-Warm-White-High-Power-Supper-Bright...

Check the sellers other items for lots more…

relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada

Thanks for the link. Your deal was much better, under $1 each!

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

FlashPilot
FlashPilot's picture
Offline
Last seen: 12 hours 57 min ago
Joined: 05/10/2010 - 16:07
Posts: 4283
Location: USA

relic38 wrote:
Thanks for the link. Your deal was much better, under $1 each!
Well, it wouldnt have cost me anything… if you hadnt opened your mouth to brag about how much you enjoyed the warm tint. Reading your posts always seem to cost me money and time… darn you!! Now Ive got to mod all of my floodlights before they even get mounted! Big Smile

The link is also best offer and I dont think any of the completed bids went over $14. There’s also lots of others on ebay. Some come in 5 packs, so dont give up.

relic38
relic38's picture
Offline
Last seen: 3 months 5 days ago
Joined: 12/28/2012 - 00:39
Posts: 3385
Location: Toronto, Canada

FlashPilot wrote:
relic38 wrote:
Thanks for the link. Your deal was much better, under $1 each!
Well, it wouldnt have cost me anything… if you hadnt opened your mouth to brag about how much you enjoyed the warm tint. Reading your posts always seem to cost me money and time… darn you!! Now Ive got to mod all of my floodlights before they even get mounted! Big Smile

The link is also best offer and I dont think any of the completed bids went over $14. There’s also lots of others on ebay. Some come in 5 packs, so dont give up.


Ahhh, my work is done here Big Smile
I will be keeping an eye on those emitters. I still have a few from my last (apparently overpriced) order.

Welcome the night.

My Reviews   My Mods    http://budgetlightforum.com/search?

FlashPilot
FlashPilot's picture
Offline
Last seen: 12 hours 57 min ago
Joined: 05/10/2010 - 16:07
Posts: 4283
Location: USA

UPDATE:

I bought a couple 12VDC Cree MK-R emitters to try out in the 10 watt floodlights.

4500K
6500K

The MCPCB wasnt DTP but its definitely copper. I reflowed the emitters onto some sinkpads and will use the copper stars for another project.

The mod wasnt a direct swap. It required a 3/16” inch aluminum plate to lift the MK-R to the same height as the stock COB emitter. I made the shim plate quite large to help spread the heat load and sanded all the surfaces for better heat transfer. I reshaped the rectangular opening of the reflector where it abuts to the emitter to make it dished so it sits flush around the MK-R

Results with driver mod:

Before:
COB CW – 30,100 lux – 13.7 watts

After:
MKR NW – 51,700 lux – 17.1 watts

The neutral MK-R recorded a 72% increase in lux over the stock COB for a 25% increase in power and provides a very noticeable increase in light to the eyes. Even more pleasing is the far better neutral tint and higher CRI over the cheap cold white COB. I think the additional watts measured from the MK-R is because it has a lower vF than the COB, allowing the driver to provide a touch more power.

topgreenlighting
Offline
Last seen: 1 year 9 months ago
Joined: 05/25/2015 - 23:46
Posts: 7

Now the price for 10W cool white LED floodlight already under $5

Professional Green LED Lighting Solution Supplier | www.topgreenlighting.com

David wei
Offline
Last seen: 9 months 2 weeks ago
Joined: 05/12/2016 - 12:40
Posts: 1
Location: China,zhejiang

Hello,I am David wei,we have the quality 10w led flood lights,
More details,pls check our website:www.dayilighting.com

A-Plus Lighting
A-Plus Lighting's picture
Offline
Last seen: 2 months 1 week ago
Joined: 06/07/2016 - 06:13
Posts: 5
Location: Shenzhen

This post is really help and useful!

But today is 2016/12/02 (sorry, guys. I’m arrive here tooooo late, haha Facepalm )

Nowadays, the latest trend of LED flood light is ultra-thin design with high brightness SMD LEDs for better heat dissipation.

Some of your must already saw and have this new hot-selling LED flood light, and some one maybe not. If you are still not, have to check this Ultra slim LED flood light!

A-Plus Lighting has 10 years experience of LED high bay light and downlights producing, working with us - your customer will thank you and always remember!

wucoco
wucoco's picture
Offline
Last seen: 2 weeks 5 days ago
Joined: 01/26/2017 - 08:10
Posts: 1

The specification you shared is a little old.

1: Now, 150lm/w led begin to be normal.

2: Most 18650 lithium battery do not have enough capacity and circles.

Now, I found an amazing solar lights, the integrated solar street lights : https://www.adnsolarstreetlight.com/

 

 

integrated solar street lights manufacture

www.adnsolarstreetlight.com

Pages