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Many good points are being made here, but just remember that Watts are not a direct measurement of brightness and/or spectrum of the light emitted from the LED.

3: The Yield.....This is pretty much what it's all about right? well the output of (1) 90W LED Grow Panel is equivalent to (1) 400W HID Grow Light..... Ok, I am game. Please explain to us all just how your 90W LED is equivalent to a (1) 400W HID Grow Light. Also, how do the spectrums compair...

Luxeon makes a very important point about selection of the proper wavelengths of light. As for "brightness" of the LEDs, I have seen a few that were so bright, you could not look directly at them... All of the better high-tech catalogs will give you some kind of intensity value...

This is not necessarily true. LEDs can be 3-Watts a piece...and there are other factors in determining the actual power consumed. LEDs can come in many wavelengths (colors), which should allow the user to select which spectrum he is trying to produce for the plant. Also, LEDs have a...

I have done a bit of reading on this stuff... SUPER BRIGHT LEDS home That website has some very bright LEDs...not the cheapest, but its a place to start looking.

With LEDs, you can select the wavelength. Therefore, you could select the mix of colors to customize/optimize the growth of the plant, based upon it needs. I have been looking for information on the effect of plant growth from "pulsing" light...with LEDs, you can drive the diode with a series...