well the light change shouldnt stretch the plants, thats more based on where and how far the light(s) is. should definately help the plant vegg alot more, try "lst" (low stress training) if the plants stretch up or even if they dont.. it'll definately do you good. search "super cropping" on youtube or low stress training on this site..cool, thanks for the info. i was wondering if the stretching at change over is going to blow up, as my space is limited?