I love the shuttered units, it would be hard for me to go back to an instant on. I've got a Richmond Screenmaker though, which should be comparable to the CTS for the most part. I ordered the 10K bulb for our unit but I'm not sure how that will relate to the 3140 CTS 6K. I wouldn't mind knowing how it does compare and I'd seriously doubt our 10K bulb would be 40% faster than a 6K, or that the 10K was really a 10K. 10K just seems a bit excessive when you don't see many other manufacturers with a bulb that strong.