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The other aspect of this you want light to get past the outer leaves to reach leaves closer to the stem of the plant.

Many high end LEDS use lenses and reflectors to control the spread of light. The light from LEDs spreads out as it travels and as it spreads out the brightness of the light drops. Instead it is a mater of focus and the size of the light. "Ī photon of light will travel a light year with no loss in power. with what you have made it only reaches to the very near leaves and not the rest. Using 1W or larger LEDs means you can use fewer LEDs to get the same amount of light but then you have to deal with heat issues. You can use low power led successfully but you need more of them. Plants do care about how bright the light is. The power level of the LED doesn't matter to plants. you need to use at least 1W high power LEDs." "the reason why you don't think this is enough light is because unlike nasa you are using regular LEDs. But when using white LED of about the same overall power level they had better growth

My orchids did not do very well with just red and blue. While many plants do well with just red and blue, some don't. A couple of things grow lamps don't use just red and Blue LEDs The NASA lamps use very specific wavelengths of red 660nm, 640nm and blue is 440nm and 465nm (I am going from memory on the wavelengths so one or two might be a little off) Most common red LEDs are 625nm which may not work well for plants.Īlso some plants use yellow and orange light to guide gowth.