The 45 lumen stock rating strikes me as extremely unlikely.
Hey, thanks. Yes, that’s what I was thinking, but you never know.
Even the “half watt” LEDs can’t reach 45 lumen output. They are generally only rated up to 100mA @ 3.4V, which would translate to 0.34W of power. To get 45lm out of that, you would have to be getting over 130 lm/w efficiency, which none of these LEDs have. The cheap LEDs in this format are only good for 20mA current. Perhaps they meant 4.5 lumens? That would actually be the likely output of standard LEDs in this format.
—
The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy
… The cheap LEDs in this format are only good for 20mA current. …
Well, that usually is their rating. Months ago I did some testing on a bunch of 5mm and 10mm leds I had lying around, bought in 2006 or so. The 5mm ones would start dieing at 140+mA, and the 10mm ones slightly higher at 180+mA if I recall right.
So, they could be hard driven to some extent (100+mA pulse driven successfully).
—
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It is the same keychain light as the Astrolux TB01, that had a bit different type of 5mm led than usual, with extra thick leads. I never measured the output before modding it but it could have been 45 lumen (so maybe 120mA).
So, Barkuti and djozz, are you guys implying that the light in question is actually using a “half watt” LED and overdriving it, in order to get 45 lumens out of it? That would be a strange thing to see. Can somebody test one to find out what the output really is? I’m really curious now.
—
The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy
45 lumens from a 5mm led when driven by 3x LR41 cells? LR41 alkaline cells have very high internal resistance. An alkaline AAA with close to 1000mAh features ≈0.22Ω of IR with little use (Duracell Plus Power AAA at the ≈150mA x-axis point, 0.5 - 1A discharge curves). A cell with less than 1/30th of such capacity would have 7+Ω of internal resistance in the same conditions, which at 100mA of drain/driving current is a drop of 0.7+V for a single cell and 2.1+V for 3 cells in series, this means no chance of hard driving the emitter even with fairly new cells. According to these figures, those 45 lumens are a blatant exaggeration or typical false advertising.
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The Red Cross Blackout Buddy emergency light (link to confirmation of modification), so you can have a warm white auto-on power outage light. Takes 3 emitters, I think.
The Red Cross Clipray is similar, but instead of a power outage light, it is a handcrank one that can run either lights, or supposedly charge USB devices (slowly).
The Coghlans dynamo flashlight is a very small crank light with 2 emitters. It seems like a good kids flashlight if it can hold up.
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Received the package of 100.
There will not be a proper review until next tuesday (I will have enough forum chat time but there will be no hands-on cave time possible).
Quick first impression of one random led from the package:
*plenty bright
*very pleasant tint to look at
*very smooth broad beam (60 degrees from specs seem correct)
*edge of the beam a bit warmer than the rest (found it not disturbing)
*at ~20mA, middle of hotspot: 3325K, duv -0.0039, CRI=97.4, R9=88.
Many will be waiting for the review djozz. Thanks.
Any 7x emitter honeycomb arrangement host or flashlight out there for these? Hexagonal/honeycomb is the most dense arrangement, I wonder why it doesn't seems to be widely used.
—
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Received the package of 100.
There will not be a proper review until next tuesday (I will have enough forum chat time but there will be no hands-on cave time possible).
Quick first impression of one random led from the package:
*plenty bright
*very pleasant tint to look at
*very smooth broad beam (60 degrees from specs seem correct)
*edge of the beam a bit warmer than the rest (found it not disturbing)
*at ~20mA, middle of hotspot: 3325K, duv -0.0039, CRI=97.4, R9=88.
Summary so far: great led
GREAT!
I’m really looking forward to seeing the results of your testing.
—
The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy
Hey, thanks. Yes, that’s what I was thinking, but you never know.
Smile, you cannot kill them all.
Even the “half watt” LEDs can’t reach 45 lumen output. They are generally only rated up to 100mA @ 3.4V, which would translate to 0.34W of power. To get 45lm out of that, you would have to be getting over 130 lm/w efficiency, which none of these LEDs have. The cheap LEDs in this format are only good for 20mA current. Perhaps they meant 4.5 lumens? That would actually be the likely output of standard LEDs in this format.
The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy
Well, that usually is their rating. Months ago I did some testing on a bunch of 5mm and 10mm leds I had lying around, bought in 2006 or so. The 5mm ones would start dieing at 140+mA, and the 10mm ones slightly higher at 180+mA if I recall right.
So, they could be hard driven to some extent (100+mA pulse driven successfully).
Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.
Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
- Yeah, but is it ultra high CRI?
It is the same keychain light as the Astrolux TB01, that had a bit different type of 5mm led than usual, with extra thick leads. I never measured the output before modding it but it could have been 45 lumen (so maybe 120mA).
link to djozz tests
I would like to get some of these LEDs when you get them restocked. Thanks.
So, Barkuti and djozz, are you guys implying that the light in question is actually using a “half watt” LED and overdriving it, in order to get 45 lumens out of it? That would be a strange thing to see. Can somebody test one to find out what the output really is? I’m really curious now.
The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy
45 lumens from a 5mm led when driven by 3x LR41 cells? LR41 alkaline cells have very high internal resistance. An alkaline AAA with close to 1000mAh features ≈0.22Ω of IR with little use (Duracell Plus Power AAA at the ≈150mA x-axis point, 0.5 - 1A discharge curves). A cell with less than 1/30th of such capacity would have 7+Ω of internal resistance in the same conditions, which at 100mA of drain/driving current is a drop of 0.7+V for a single cell and 2.1+V for 3 cells in series, this means no chance of hard driving the emitter even with fairly new cells. According to these figures, those 45 lumens are a blatant exaggeration or typical false advertising.
Thu, 09/19/2019 - 23:42; Fri, 09/20/2019 - 15:30; edited for clarifications.
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- Yeah, but is it ultra high CRI?
Won’t ship to Germany but thank you :-).
Smile, you cannot kill them all.
Try this: https://www.ebay.com/itm/10PCS-set-1-5V-AG3-LR41-392-SR41-192-Alkaline-Button-Coin-Cells-Watch-Battery/311948692839
Or this other one with a different brand: https://www.ebay.com/itm/10pcs-Lot-AG3-SG3-LR41-192-Alkaline-coin-Button-coin-Cell-Battery-Suncom-New/191977303038
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- Yeah, but is it ultra high CRI?
Yes, got a couple of them
Smile, you cannot kill them all.
Update: The next shipment is said “out of delivery”, but this is very late in the day where I live and the courier has not arrived.
I will put the worst-case scenario that the next shipment will arrive on Monday.
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
i would be interested in a pack of these LED’s when you restock them — thank you.
Some additional potential host options.
The Red Cross Blackout Buddy emergency light (link to confirmation of modification), so you can have a warm white auto-on power outage light. Takes 3 emitters, I think.
The Red Cross Clipray is similar, but instead of a power outage light, it is a handcrank one that can run either lights, or supposedly charge USB devices (slowly).
The Coghlans dynamo flashlight is a very small crank light with 2 emitters. It seems like a good kids flashlight if it can hold up.
I would love to participate but don’t know how to use these emitters. Do they require soldering? Also which flashlight host can these go into?
^soldering is required. You will find LED similar to these on keychain lights, or some other flashlights discussed earlier in this thread.
There is also an interest list by Djozz for C01 host, but I’m not sure if its ever going to happen.
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
Which not?
There have been some mentions here:
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- Yeah, but is it ultra high CRI?
Round 2 shipped:
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
I have got a phone call from the shipping comany about the import charges and that the shipment will arrive soon.
I can wrap up to about 10 packs today. Book & Pay before
21:00hrs22:00hrs GMT+7 for the 3rd round.Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
Reinforcement Lot no. 2 has arrived!
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
Round 3: Shipped
Chatika vas Paus – RR146459745TH
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
I pulled 3 random LEDs from the 2nd batch for spot-check.
Here’s the light (appearance) test on 5500k WB and 2800k WB
https://imgur.com/a/5P4iLzH
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
Tracking numbers update:
Phosphor22 – LX054010845TH
e1000 – LX054010831TH
Kame Sennin – RR146459793TH
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
Received the package of 100.
There will not be a proper review until next tuesday (I will have enough forum chat time but there will be no hands-on cave time possible).
Quick first impression of one random led from the package:
*plenty bright
*very pleasant tint to look at
*very smooth broad beam (60 degrees from specs seem correct)
*edge of the beam a bit warmer than the rest (found it not disturbing)
*at ~20mA, middle of hotspot: 3325K, duv -0.0039, CRI=97.4, R9=88.
Summary so far: great led
link to djozz tests
Wow! Sofirn should get some of these.
Many will be waiting for the review djozz. Thanks.
Any 7x emitter honeycomb arrangement host or flashlight out there for these? Hexagonal/honeycomb is the most dense arrangement, I wonder why it doesn't seems to be widely used.
Deleting a just published post causes the forum thread answer notification to fail. Thus, if you need to change your just published post, edit it. Thanks.
Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.
- Yeah, but is it ultra high CRI?
How about this as a host? It’s 0.5w though, so I don’t know if my LEDs would survive that.
https://www.aliexpress.com/item/32833777655.html?spm=2114.12010612.81483...
Searching for High CRI leds since 2010...
Has finally gotten to the bottom after 10 years of delving deep into that rabbit hole of them high CRI lights...
High CRI, high quality lights doesn't need to be expensive, or is it?
Received! Many thanks.
[WTS] HID host: http://budgetlightforum.com/node/68693
[WTB] Interesting LEDs:http://budgetlightforum.com/node/68968
GREAT!
I’m really looking forward to seeing the results of your testing.
The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy
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