If they're LEDs they should be fine. the little bulbs in the colored glass may be a different story, though. iirc, LEDs will only give off a certain frequency of light, nothing more. the glass bulb ones are probably just regular bulbs, as in not safelights, with tinted glass over it. Unlike safelights, you don't really know how much light it filters out and at what wavelengths. it really wouldn't be much trouble to test them, though.