Oh, Man edited his post.
Yes, "filament" light sources are very predictable. Vapor lights are not at all predictable and sometimes simply can't be corrected for entirely. Of course, filament lights are becoming less common. It remains to be seen how easy or difficult LED light sources will be to work with.
Yes, "filament" light sources are very predictable. Vapor lights are not at all predictable and sometimes simply can't be corrected for entirely. Of course, filament lights are becoming less common. It remains to be seen how easy or difficult LED light sources will be to work with.