I'm about to grow trays of arugula and microgreens in shelving units.
Possibly other greens as well in the future, but I'm starting with these two crops.
Microgreens don't seem to need a very high PPFD while arugula seems to like a DLI of 17.
The arugula numbers are based on this article:
https://gpnmag.com/article/growing-hydr ... fy-greens/
17 DLI is reached at 300 PPFD during 16h, which is what I'm aiming for.
I am currently growing with a concept lamp that I chose from diy-led-strip-build-designs
Samsung F-Series LT-F562B 2′ LED Strip Build – 2’x2′ (SI-B8T261560WW)
I have a square meter with reflective mylar walls surrounding it.
When I placed the strips in a square format, I reached a quite even PPFD footprint. Averaging all the numbers out, I landed just shy of 300 PPFD at 30cm distance.
I am currently test-growing arugula with 17 DLI and hope to somehow be able to transfer this light intensity and concept into shelving unit format in the near future.
I took a peek over at HLGs website and from their provided wattage and measurements of the HLG65 and HLG100, a PCB surface area of 10cm2/w seems to be enough for decent passive cooling without a heatsink. Can I apply the same thinking to Samsung strips?
The strips I used now did great intensity-wise, but may not be as practical in a shelving unit and seem to be a no-go without a heatsink.
I see that the Q-strips at Digikey (SI-B8T101560US), are tested with 450ma and 21.9V. If I am not mistaken, this results in just below 10w of power and with the strips being 560.00mm L x 18.00mm W, that makes it roughly 10cm2/w.
I have not yet figured out the different ways of driving strips and the pros and cons of different solutions. I have the Q-strips in mind, thinking about my next version for this lamp in a shelving unit.
Am I on the right track? Any input on this would be greatly appreciated.
Thanks!
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