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Samsjng horticulture linear leds are indeed expensive :/ I found Bridgelux EB gen 3 on digikey, would take 12 of them but they don't have warehouse inside EU and I would have to pay extra tax (~36% of total price). That way it would be better for me to go with invisiblesun QB, BUT I've read...

I will take a lok at EB gen 3 stripes. Although I only found shops selling samsung 1ft f series in 160pieces minimum.

Well I'm limited by 50x50. @coreywebster F-series are sold only in box of 160 pieces. H-series don't state type of smd led used, but Q-series has samsung lm301b. I'm still thinking of buying some 30-40W cobs and running them low, but it's efficency is lower than of those stripe leds.

Did you use any kind of holder or pre-made heat sink or just screwed it into aluminium heat sing with thermal paste?

How did your plants grow under those sma cobs?

Hello guys I need help from you. I've read tons of stuff about led lights, cobs and qb's. And I want to start growing on my own. I have unused cabinet 50x50x100 (or 120) which I want to use as grow box. Planning on growing 1 (max 2 plants if I get wider box). Question is what light would be...