Bulb change time What should I get

[Myka]

You're running 400w SE's on an HQI ballast? No wonder they are bright!!! The HQI actually overdrives the SE as HQI are deisgned to run DEs. The Giesemanns are often nice bulbs. I realy like the 250w 13,000K SEs, but they are an expensive bulb, and the Ushio and XM have higher PAR (if I remember correctly...I haven't been up on lighting lately).