sounds like you've cooked them, but without a photo, it's just a guess ... what is a 250watt 'LE" bulb ? , sorry, I'm not remembering an 'LE' ... I'm wondering if you're using an incandescent lamp (no good), if so, that's your problem... also, MOST growers use an 18/6 lighting cycle, although some wrongly assume 24 hr is better ... that argument will last until the end of time, I suppose ... as previously mentioned, you always need air movement in there with the plants ... go read the Basic Growing sections, and don't be afraid to use the 'Search' function ... good luck :smokin: