For safelights I use DC and AC LED arrays. For intermittent white light when switching back and forth from safelights, I use white AC and DC LED arrays. For general set up and clean up, measuring and mixing chemicals, and judging color balance I use daylight balanced high CRI (color rendition index) fluorescent tubes and spirals. I turn off the fluorescents far enough ahead of using light sensitive materials for the glow to dissipate. Used in reflectors pointed at the ceiling, the glow from spiral fluorescents is not a problem after a few seconds.