the first plant i ever grew was grown with a 225w incandescent spotlight, my yield was 13.5 grams dry after about 4 1/2 months of growing. it stretched a fair amount but grew surprisingly well and never got burned. incandescents are by no means good for growing but coming from someone with experience they arent as bad as everyone says, i think the bottom line is they are simply too inefficient and put off too much heat to be useful in an indoor growing situation. personally i think they are too inefficient to light my house with