Shun Cheung , Sep 16, 2008; 04:09 p.m.
There are reasons that Nikon put the thermostat inside the SB-900. If you switch off that function, you run the risk of overheating and shorting the life of your flash. I think wedding photographers who take a lot of flash shots in quick succession should alternate between 2 or even 3 (groups of) flashes. For example, make it a habit to change your camera battery, memory card and flash just before the main ceremony. If you shoot formals with a flash, perhaps change flashes again. As a wedding pro, you really should have multiple flashes as a backup anyway.