i have those same bulbs starting some off .... any heat issues for you? i've got mine set up in a cab that's 2-1/2 ft tall, 1-1/2 wide and 1-3/4 deep. they're set in a reflector instead of hangin out, but the edges of my leaves started turning yellow/brown (thinking maybe too close to the light(s)?) what's the closest yours get....