So ever since I started looking for a new light, I've always wondered what the absolute perfect grow light would be in a 2x2x4 tent. Now that I have the knowledge of how to build it and how everything works, I thought I could do it until I looked at at how much it would cost. Here's what I found about what the LEDs would have to be:
So, a 4000k lm301b is 38l.
At the spectrum of those diodes, that is 0.71 ppf
Which would translate to 1.53 ppfd in a 2x2 if 80% of the light reaches the canopy.
1000 (The perfect ppfd without CO2) / 1.53 is 654.
So you'd need 654 lm301b diodes to get the perfect ppfd without CO2.
To get the perfect number of diodes for with CO2, we just multiply that by 1.5 to get 981 diodes.
Now, the actual maximum light the plant can handle with tons of CO2 and everything is 2500.
So we multiply our original number, 654 by 2.5 and we get 1635.
This is all without ir and uv which wouldn't contribute to the ppfd but would be needed in the perfect light.
So the final costs for just the diodes for each ppfd is...
1000ppfd: $112
1500ppfd: $143
2500: $234
Might I remind you this is only the diodes.
Then I'd still have to but the ir and uv, the driver, the heatsinks, the wires, the solder, the potentiometer...
Plus the perfect light would have to be spectrum controllable so I'd have to get double the number of diodes for a bluer spectrum and a redder spectrum.