As an HC projector owner, I give my unit plenty of time to cool before restarting and take great care not to disturb it whilst it is hot. Basically I follow all the good advice given on this forum to look after it. However, my job involves carting a lap top and projector around for various presentations, and it occured to me how I (and others) rather abuse the companies projectors... yet they're all a few years old and still fine!! As an example, today I had 3 presentations to deliver in 3 seperate venues. The projector was turned off and on at least once during each session, and was packed away in its case and carted around whilst still hot! I also didn't give the unit time to power down probably.... I just unplugged it! Unless you're into H/C, anyone who uses a projector for work probably won't have a clue how to look after it. But is it really necessary? Are we over reacting in our efforts to protect our HC projectors?