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Hi supra. Cool to see that you have taken the next step to the cxb3590. But why don't I see any reflectors on your new build? I could have missed some posts, began reading but 100+ pages is a lot in a few weeks...

on the picture: the led on top is 5000K, the other one is 2700K. I use 5000K and 3000K, the only difference is the colour of the yellow.

Close blue? No one here wants to slow down I think. You could try giving the plants less light.

Yes, read this thread. 730 nm is the way to go.

malfunction of my timer. Cheap stuff. But cool to hear that you "tried" it also. Did it had any effect of flowering time and did it had any effect on your harvest? Are plants still in flower-mode or are they in Veg-mode?

I just tried 730nm allways, in the beginning of week 6 (2 weeks before harvest). Have seen very much stretch, plants which grow continously. I did not know that 730 nm was on, bummer. Will plants go back to flower and how long would it take to harvest? Does anyone has an idea?

Did you grew a rock or something? Congrats.

I did some "testing".....I had one 3070 5000K in a propagator, without a fan so just using the heatsink of the alpine (needed asap some light for a week or so). Running @1.4A (50 watts) the top layer of the led broke but it still works. Temperature in the propagator was about 22 degrees.

Something like this? http://www.bmlhorticulture.com/led-light-bar-3000k-warm-white/ I like the light, would like to test them sometime. So if Osram reads this....

There are more growlights with Osrams...they look very good to me, I am very curious how this test will end. http://www.bmlhorticulture.com/spydr-600-grow-max-spectrum/

Ordered yesterday, very curious to the results.

WTF I see it now...Misinterpreted the ' and the "... inch/foot.. well that clarifies it...

The reason behind some calculatioins is often not my strongest point....but I will remember it. Thanks for explaining it to me. Edited my former post: the 36% is the Osram I was referring to, you were referring to the ledengin.

Still expensive, but easy to build yourselves. How did you calculate 28%, they state 36% in the datasheet. -edit: ooops..36% is the Osram. 28% is the LZR from Ledengin.

first it was $199,=. :o But yes, ripoff just like many blurple panels. Ledengin has them also for $ 75,= but they use a different chip: http://www.amazon.com/Watt-IP65-Indoor-Outdoor-LED/dp/B00T8O5YR8

Well, I have these: http://www.alibaba.com/product-detail/Low-Price-Epileds-Chip-10w-High_60161421092.html. Name, type, shape..all the same.

That explains it....when using 625 watts for my growing room, the plants shoot through the roof I think. Thanks for your reply.

I was wondering about the flower initiator. According to the man that sells them: http://growlightsource.com/products/the-flower-initiator-and-booster-grow-lights/, one 20 watt light (730 nm) is good for 16' x 16' = 0.16 meters. For 1 square meter you need 6.25 of those 20 watt leds, 125 watts...

In the Vipar LED thread the efficiency of the deep red epileds was mentioned: 7.2% @350ma and 25C. Very low. Alternative is the Osram SSL 80 730 nm has an efficiency of 36% (according to their own data). Mouser does not have them on stock, Led tech does...

Led tech emailed me. The Osrams SSL 80 730 nm are on stock. https://www.led-tech.de/en/High-Power-LEDs-Osram/Osram-Oslon--SSL/OSRAM-Oslon-SSL-80-Far-Red-on-Star-LT-2520_206_207.html