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This article may be helpful.

I don't worry much about lux. For most of us, 2-4 4 foot fluorescent tubes as close as possible to the trees does a nice job. Note that lux is a function of distance from the light source. Thus, the most powerful light you can buy "up on the ceiling" may not deliver as many (?) lux to the plant as a fourescent up close and personal.

Don't bother with "grow" lights, unless you are growing flowers or fruit. The noonday sun type fluorescents promote small leaves and close internodes. Cheaper, too!

21-Feb-2005	#3
Bart Thomas(deceased) Perpetual Novice Join Date: Jun-2003 Location: Bridgewater, NJ Country: United States USDA Zone: 6 AHS Heat Zone: 5 Posts: 1,367	This article may be helpful. I don't worry much about lux. For most of us, 2-4 4 foot fluorescent tubes as close as possible to the trees does a nice job. Note that lux is a function of distance from the light source. Thus, the most powerful light you can buy "up on the ceiling" may not deliver as many (?) lux to the plant as a fourescent up close and personal. Don't bother with "grow" lights, unless you are growing flowers or fruit. The noonday sun type fluorescents promote small leaves and close internodes. Cheaper, too!