Originally Posted by
Rob Ekins
Victor,
The lights used to light that stage are all Par 64s as far as I can see. They are a tungsten lamp usually pretty close to 3200K. These lamps will all have the same source no matter what gel/filter the Lighting Director decided to put in front of them therefore they will all have the same colour temperature.
Setting the white balance to 3200K will give you more accurate control of the colours when the lamps are at 100%. This particular type of lamp though is dim-able so colour temp will vary widely during the show but it is best to start with 3200 WB so as you get a good starting point.
If the lamps on stage were non dim-able like most modern stage lighting fixtures are (LED excluded) you would not have this issue as the lights output is controlled by mechanically flagging the optical path not reducing the power to the globe, the result being constant colour temp but varying intensity.
EDIT.
I just noticed 3 x MAC250s on the floor in the last shot these are the type of lamp I was talking about being non dim, as you can see in that last image the three lamp are at varying intensity yet the blue light being emitted by them is pretty much the same across the three lights as there is no shift in colour temperature with the mechanical flagging.
Robbie.