All sounds very good except that's one big bulb! I'd bet that baby gets so hot you can't touch it, yes? I know my 46W cfl's do and their not even half the bulb you got there. And yes, I do realize you have a real 105W CFL and not a "equivalent" rating, in fact a 105 watt bulb has a incandescent equivalent rating of 420W. Anyway, it seems like it may have cooked it. It'd put it up about a foot and monitor heat at the plant tip with the back of your hand method. Does your hand get hot at 2-3 inches under the bulb? Seedlings are like women, they are very sensitive and delicate.

Your temps, was that in the room/cabinet shade or at the plant top?

I'm far from an expert, but for just a seedling I'd have a smaller bulb and put it further away... Perhaps a 23W and about a half a foot up? I'd use a big bulb like that after a few sets of leaves grow in and you start adding nutes. Let's see what some of the resident experts have to add to this mystery. :detective1:

Quote Originally Posted by sams3489
First time grower.
Using one 105 Watt CFL rated at 6900 Lumens with a color temperature of 4500 Kelvin. It is about 2-3 inches away from the top of the plant and I am using a round 10" reflector with a concrete socket. The light is on 24 hours.

There is a constant fresh air supply and air circulation has not been a problem.

I am using an all organic growing mix containing Canadian sphagnum peat moss, volcanic perlite, natural dolomite lime, and a natural organic fertilizer. This is in a 4"x4.5" round ceramic pot prefilled with 1.5" of river rock for drainage. No nutrients have been added.

The plant was grown from seed.

I am using tap water with an initial pH of 7.4 which i regulate using a diluted solution of sulfuric acid. I adjust the pH to 6.7 before watering and I usually water once a day.

This has all been done indoors in a stable environment free of insects. The temperature is kept between 75 and 82, while the relative humidity stays between 35 and 45 percent.