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Hi guys! I've seen passive and air cooled surface area requirements but what about water cooling? If i have a water cooling system that can handle 25 celsius (80F) consistenly, how large should the heatsink be or is it irrelevant because of surrounding ambient temperature?

Are you doing custom orders? I'm after 200 boards or strips. PM me ;)

Is Are these strips really top bin? I see low, typical and high on the datasheet. Dosent this mean they use all types of bin in this model?

Frica Great to see someone more reading studies about lettuce ^^

Which diods are you using for 240w and 100w horizon?

OneHitDone The discolouration in lettuce from LED is the biggest issue to tackle. We cant sell a product like that. After that is umol/W, to get over 3 umol is what i'm personally aiming for as the biggest cost for growing indoors is electrical bills. Got more money for light research, do you...

You're on point. Remember not to exceed 20 mmol/d or you will get tipburn. Would anyone here be intrested to start a skype group for vegetable testing, studies and buisness talk? My research is for commerical indoor farming and would love to talk to same minded people :) Designing my own light...

Great to hear randomhero! Tried clu048 gen 5 3500k and 5000k already but had problem with uniformity so going with diods instead. Umol/s?

Well seems that i have to do everything myself as no one here are intrested in spectrum respond in lettuce anymore. I have orderd XP-G3 cold white, neutral white and warm white. LM561C 3000k, 3500k, 4000k and 5000k strips. XT-E royal blue and XP-E photo red. Will do the following test in the...

Borrowing the thread; Which cree mono in royal blue is most efficient? XP-E, XP-E2 or XQ-E? Also the new bin for XP-E photo red seems to have reduced in size compared to older bins. Have trouble to find mcpcb that fits it. Going for blurple setup to my lettuce garden as i'm not happy with the...

No problem at all. Just backing up my statement that 50w of CLU048-1212 at 1400mA gives out 2.14 umol/J/W and not using CXB3590 numbers.

Without drivers 480 Euro. Yes you can easily upgrade the cobs. The heatsinks have a capability to 50W of any cob. CREE and bridgelux is good options.

Here you go, see attached file Efficiency for both drivers is 93,5%.

Samsung M series 1120mm = 33.6W 4000K 158 lm/w Bridgelux EB 1120mm = 31W 4000k 159lm/w

No you are counting wrong. Look again.

https://www.arrow.com/en/products/si-b8t341b20ww/samsung-electronics Same price as Bridgelux EB series

You're right, It probably has the same effciency but gives out less PAR. Would be so much easier if they had an calculator on their website as Samsung does.

This means that Brigdelux diods is not as efficient as Samsung. Samsung M series have the same lumens output but i believe their LM561B plus SMD leds have a higher QER and lower LER. Which means overall PAR output is slightly higher. LM561B plus LER and QER is probably the same as LM561C as...

With your data at 15" above canopy PF/W = 1,36 umol/J

With your data at 9" above canopy PF/W = 1,77 umol/J