> There's something called the "inverse square rule" that describes how the > apparent brightness of a light source diminishes with increased distance: > http://www.intl-light.com/handbook/ch06.html That's fine as far as a point source of light goes, but a flourescent tube is more like a line of adjacent point sources. There was a site somewhere (maybe the defunct Lynn Edwards site?) that gave an explanation. Still, at six feet (less the plant's height) there would be a lot of loss. A reflector would help some, but reducing the distance is probably best. If the plants get to be established they may require some light from the sides since the upper leaves would effectively shade out the lower leaves. Great, now I've got Rush running through my head..... There is unrest in the garden, there is trouble with chiles. For the lower leaves want more light, but the upper ignore their pleas... Scott... KCK