I bought a used $40 Thomas Duplex safelight today. The filters were kind of beat, so I replaced them with Rosco #19 "Fire" which has the right type of wavelength cut off:
The thing is so bright you just don't expect it to be safe, but it is: after flashing some MGFB IV and doing a ten minute coin test with the unit full open, there was not the slightest hint of fog. It's like daylight in the darkroom!
EDIT: THAT ? WAS SUPPOSED TO BE A HEART