What are the differences between white and this darkroom red/orange active autofocus assistance lights?
Answer
AF assist (if that's what you're referring to) is simply a way to illuminate a dark subject to help the camera focus. The colour of the light isn't really important - what's more important is that it (a) is bright enough to allow the camera to focus (b) doesn't adversely affect the metering and (c) is efficient in terms of battery use. A red LED would seem to be the best way to meet all these criteria, which is why it is the most common kind. Of course LED technology is improving all the time, which may explain why some cameras can get away with a green beam.
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