Electronics > Beginners
grow led diy
Irukandji:
Sorry for the late response.
Thanks for your feedback so far.
I found these LED's on ebay, but im not sure if they have enough power for my little grow box.
Link
https://www.ebay.com/itm/10-x-High-Power-LED-OSRAM-OSLON-SSL-660nm-hyper-red-Platine-3W-Pflanzenwachstum-/172846213449
All in all its for some garden plants like Physalis, paprika and chili.
The box size is 90 x 60 x 60 cm. Im not quite sure if i get enough light out of my LED' stripes. They running with 5050 smd LED's.
Link:
https://www.ebay.com/itm/5pcs-SMD-5050-LED-Grow-Light-Strip-Lamp-for-Indoor-Veg-Flower-Plants-Hydroponic/264077183863?hash=item3d7c3a0b77:g:Mn4AAOSw3fxcCiz-&frcectupt=true
honeybadger:
Why do you want RED-BLUE combo? I guess it is obsolete, go full spectrum, all plants will benefit from that. Bellow 4000K for bloom, above 4000K for greens.
You can use for example these PROLIGHT OPTO PACE-28FNL-BC4P. If you drive them at around 10W each you will get 200lm/W - it is comparable with most efficient and most expensive grow lights.
And for 90x60x60 you will need a LOT of power so don“t be surprised. I guess at least 100W for blooming plants. A sunny day outside is 100k-200k lux - you can calculate how much lumens you need for your box. It is a LOT :)
Zero999:
I thought plants grow best with mostly red and a little blue light. I'm aware that other wavelengths are often useful, to instigate flowering and fruiting, but not most of the time.
honeybadger:
The blue-red combo it is most useful for chlorophyll only but there is a lot more.
Check this: https://en.wikipedia.org/wiki/Photosynthetically_active_radiation#Yield_photon_flux
thedoc298:
For a string of six blue LEDs:
R = (V-VF)/IF
V = 24V
VF = 6*3 = 18V
IF = 0.3A
R = (24-18)/0.3 = 6/0.3 = 20Ohm
20 ohm ^^^^
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