looking for LED-efficacy-data as complete as possible

M

mannitu77

Active Member
Hello men,
i know lots of people here like numbers and diagrams, im looking for something that gives me information for all the common LEDs in growlights, in terms of umol/J, also at different currents...sure there must exist something? people just love rankings and "top tens" but i get nothing that helps when i try Google. Ive seen some small diagrams here in the forum. Im looking for something that really helps you, for example when calculating how efficient your DIY lamp will be, making a decision between more expensive boards/strips, or older ones and therefore go with higher diodecount etc..someone could really use some complete and detailed charts here.
 
Charts / par numbers should be taken with a grain of salt. Many brands overhype the “ numbers and performance “.
Paper charts are more marketing than real world results. There are losses from heat / driver efficiency / diode quality / etc.

Think car window sticker info ….. car mileage / efficiency. Looks good on paper …. But it usually ends up less.
 
Back in the days of COBs there Used to be a few kicking about comparing cob to cob of different brands at different currents .

With the birth of boards and strips alot of the mega geeks have disappeared now it's all pretty much cookie cutter grow lights.

You can always go data sheet hunting yourself

Edit

Mega geeks in the complimentary sense.
We wouldn't be where we are now and nor would any of these LED companies without the legends of the DIY LED communities
 
Last edited:
guys im not thinking of a "what lamp is the best" thats highly subjective. But there sure can be chart for, what diode is the most efficient at what current, what colour and bin and so on. You could see if your 2 boards with cheaper diodes are same or more efficient than a 301B Board. It would make it way simpler to make a plan for a DIY lamp.

for example, right now i would guess 2xqb288 with Lm281B+ are more efficient than 1 QB 288 with LM301B diodes. Given the same power. But its only a guess, there are so many different numbers, but most time you dont see what bin, or the numbers are only for 1 certain current etc.etc.
 
mannitu77 said:
guys im not thinking of a "what lamp is the best" thats highly subjective. But there sure can be chart for, what diode is the most efficient at what current, what colour and bin and so on. You could see if your 2 boards with cheaper diodes are same or more efficient than a 301B Board. It would make it way simpler to make a plan for a DIY lamp.

for example, right now i would guess 2xqb288 with Lm281B+ are more efficient than 1 QB 288 with LM301B diodes. Given the same power. But its only a guess, there are so many different numbers, but most time you dont see what bin, or the numbers are only for 1 certain current etc.etc.
Click to expand...
Sure a one and done chart that eliminates all competitors
Nope
 
mannitu77 said:
guys im not thinking of a "what lamp is the best" thats highly subjective. But there sure can be chart for, what diode is the most efficient at what current, what colour and bin and so on. You could see if your 2 boards with cheaper diodes are same or more efficient than a 301B Board. It would make it way simpler to make a plan for a DIY lamp.

for example, right now i would guess 2xqb288 with Lm281B+ are more efficient than 1 QB 288 with LM301B diodes. Given the same power. But its only a guess, there are so many different numbers, but most time you dont see what bin, or the numbers are only for 1 certain current etc.etc.
Click to expand...

Get to number crunching and post your findings.
 
Maybe someone over at this forum could help

budgetlightforum.com

UV led test: '3rd gen.' LG 385nm 3535-size led

I bought 10 of these 385nm leds mounted on 20mm aluminium stars from Aliexpress, 2 dollars a piece (no idea how long the listing will last, but it is still listed at the moment of this write-up). I never had a 385nm led before, I was curious if it had the same visible light 'pollution' as most...
budgetlightforum.com budgetlightforum.com
 
mannitu77 said:
guys im not thinking of a "what lamp is the best" thats highly subjective. But there sure can be chart for, what diode is the most efficient at what current, what colour and bin and so on. You could see if your 2 boards with cheaper diodes are same or more efficient than a 301B Board. It would make it way simpler to make a plan for a DIY lamp.

for example, right now i would guess 2xqb288 with Lm281B+ are more efficient than 1 QB 288 with LM301B diodes. Given the same power. But its only a guess, there are so many different numbers, but most time you dont see what bin, or the numbers are only for 1 certain current etc.etc.
Click to expand...

If you used Samsung strips, all that information is readily available using the Samsung Engine Calculator.
 
I know it's not the answer you want, but all the info you need is in the datasheets. Easy to find, easy to compare. The problem is when every company claims to have "top bin" Samsungs how do you know who really has them? The datasheets only tell you the theoretical highest bin. They don't tell you the production yield which determines what bins everyone gets.

FWIW we don't use Samsung diodes because there are better diodes out there.
 
Grow Lights Australia said:
I know it's not the answer you want, but all the info you need is in the datasheets. Easy to find, easy to compare. The problem is when every company claims to have "top bin" Samsungs how do you know who really has them? The datasheets only tell you the theoretical highest bin. They don't tell you the production yield which determines what bins everyone gets.

FWIW we don't use Samsung diodes because there are better diodes out there.
Click to expand...
everything is in the datasheet? what datasheet you talking about? Samsung? Theres only lumen there. And not even for different currents. Maybe you can show me a datasheet that shows umol/J for tzhe LM281B+ SE rank if its easy for you.
 
mannitu77 said:
everything is in the datasheet? what datasheet you talking about? Samsung? Theres only lumen there. And not even for different currents. Maybe you can show me a datasheet that shows umol/J for tzhe LM281B+ SE rank if its easy for you.
Click to expand...
Start here: https://www.rollitup.org/t/math-behind.868988/

You need to digitise the SPD then work out the efficiency by dividing lm/W by LER, then multiply by QER to give umol/j

Here's an example: LM301B CRI90 3000K

LER = 297lm
QER = 4.92
SG bin = 31lm @0.065mA and 2.75V = 173lm/W divided by 297 = 58.4% efficient

58.4% x 4.92 = 2.87 umol/j
 
who dares to give an efficiency guess in umol for this light:
-240watt ELG 240-48(93%)
-6 Quantum Boards LM281B+(Se-Rank), 7.2 diodes per watt
-139mw or app. 50ma per diode
-1728 diodes alltogether, 192 of them Epistar 660nm, rest is LM281B+...not sure about these 4UV and IR per Board...
 
mannitu77 said:
everything is in the datasheet? what datasheet you talking about? Samsung? Theres only lumen there. And not even for different currents. Maybe you can show me a datasheet that shows umol/J for tzhe LM281B+ SE rank if its easy for you.
Click to expand...
That diode isn't intended for horticulture applications, so you aren't going to derive umol readings from it. You can get luminous flux ranges however. It's basically a linear curve, dependent on current. You would have to do the math.

Screenshot 2022-09-08 11.25.31 AM.png
Screenshot 2022-09-08 11.23.14 AM.png
 
thats pretty worthless but i appriciate your efforts...i know the samsung website, unfortunately its not as easy as you think.
 
mannitu77 said:
who dares to give an efficiency guess in umol for this light:
-240watt ELG 240-48(93%)
-6 Quantum Boards LM281B+(Se-Rank), 7.2 diodes per watt
-139mw or app. 50ma per diode
-1728 diodes alltogether, 192 of them Epistar 660nm, rest is LM281B+...not sure about these 4UV and IR per Board...
Click to expand...
I don't believe HLG ever made a Quantum board in this configuration. If you are referring to a Chinese knock-off then you will need to know exactly which diodes were used, ie; CCT, CRI and forward voltage bins.

If you take the time to read the link I posted you would be able to work out the umol/j of almost any diode out there. Perhaps I was wrong to say it is easy but for those who know how to do the calculations it is not that hard, just a little time-consuming. But if it is something that interests you then it is worth taking the time to learn.
 
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