I've done a lot of looking around, talked to quite a few indoor growers, talked to electrical engineers (3). Their suggestions all sound like we should all look at lights designed with modular parts, plug and play, so if digital ballast goes,just plug in the new one. same for cooling fans & and light modules too. There is one manufactuer that come very close to this ideal. They also have the best heat sink for the light mod that I've seen. [URL="http://www.hydrogrowled.com"] All of their light seem very well made. Have the big 300 something can't remember this moment, but crap you GOT to wear sunglasses if your under it. Thet do somthing with the lenses on their leds put out like crazy. They claim its on the same PAR value as a 1000W HPS! Just got this one, and time will tell, but damn its looks great so far.