Recent content by speedyganga

Osram square is 2mil chip, xpg3 is 2 mil chip. Both ceramic. These two leds are almost the same... 2% difference? $/umol is the most important parameter here. Now these datasheets are bullshit... It is made with pulse current at 25°c on bare led so it is not even a PCB efficiency. Both of...

Hello, lol anyone can read something on the internet, doesn't mean it is true. If you too put it here without checking then your create false infos. I don't see no UVB neither in the spectra mentioned ... But there is UVA for sure ! I saw positive difference with 4200K and 3000K CMH...

Nichia doesn't sell 660nm LEDs, only 630's

Any board designer knows that this is not conform with electrical security norms... Copper plane should have 3mm distance to any metallic part, screw head, holes and board outline included !

thanks for sharing the specs :) u wana make a company ? start by making a pro email... It shoes you take care of the business. 'cause @gmail won't make people confident my2cents

Nice room, and clean diy ! I had the same ones before, they are smt like 160x50x1000cm, I build them with 200w COB too, not even hot the touch without fan on top. I guess you could have a 12V fan on top and run 600W on this big heatsinks. Could save money and make it ligther ;)

I measure... How would i tell you 8-900ppm all the time, if I dont measure it ?! It is to 1000+ppm when we sleep. Well if you go sealed you need co2 injection. There is a minimum. It is the one when plants can't breath. Anyway, i guess i figure it out: i am out of the race already. In my...

Co2 system ? hum... myself ;) I grow on small scale in my place, Co2 is above 8-900ppm all the time. I actually don't know the minimum extraction, I read many time for 3 to 10x and hour... I agree I would need more information on this... Exhaust less, yes, but I already exaust very little...

well, It can surely be done, but it is more complicated then what you think. 110V AC doesn't mean 110V max amplitude... you would fry them like eggs ;) You need to calculate the Veff for 230V it is about 308V if I remember well. just multiply by sqrt(2)/2 Secondly driver are SMPS and have...

You could run a few cobs harder in winter, it will provide you good light and more heat... :) In my opinion a steady environnent is the best. I grow SOG with 1-4 plants a sq foot depending on hydro or soil, so increasing PPFD and defoliation helps me a lot to achieve big yields in a small...

Yep, I like to grow the max out of my space, I don't have much so I can't dedicate a entire room or basement like you guys do in US. Did you try going at 1300ppfd and up ? Find plants really enjoy it ! they just grow stronger :) But It make sense I could maybe lower my intensity and harvest the...

Yes, very true Rahz , but... Why would I run 100W at 65% ? I said before, max PPFD achieved for every efficency, if I run at 65% I reduce the total power. if the room needs 50W PAR to be max out I will run 100W @ 50% but only 67,5W @65% and this is where I was saying at some point there is a...

I presented it like a Maths system because it really is actually. But is more something I experienced, improving each year my COB... I am geek tech anyway and will continue to do so, but still, no need for weapon race in LED grow rooms :)

Use a 12 position Nob check out "3in1 dimming" thread from stardust. Here I gave you a scientific study showing you that LED need at least 80F ambiant Temp to achieve a good efficiency, maybe even 84F is using monos. I wanted to discuss if really more efficient light means more efficient...

Well I guess we just sa the exact same thing, limiting factor at some point does not come from light efficiency any more. We don't need 65% efficient LED in every situation. I suggest you try to increase the Temp to 80F if growing under COB, you will see they will start to grow much quicker...