I made the mistake of replacing a 15 watt safelight bulb with a 15 watt CLF, ONCE! The output is nearly equal to a 40 or 60 watt lamp. fog city big time! Never again.
I'm having good luck so far with a red LED "bulb" with the standard medium screw in base. It actually has maybe 24 individual LEDs and the circuitry to run them off 120 V. Not knowing the exact spectrum, I still have it behind the red safelight filter to be safe. It runs very cool. I got it from www.superbrightleds.com. I would suspect other makers are getting in on this market too.