All films can be developed by inspection. It matters what safelight you use, though, but mainly because of how your vision works. Dark green is what you want, because your eyes are very sensitive to this. It helps if you use a developer such as Pyrocat, because it somewhat desensitizes the emulsion, to turning on the safelight doesn't affect the films so much.
I developed Tri-X, FP4+, HP5+ like this, using a metronome to count time (counting seconds becomes second nature after a while) and it worked great.
With orthochromatic films, you eliminate the spectral sensitivity to red light, and you can therefore use a red safelight for it, and it's much easier than the dark green light with panchromatic emulsions.
Then, of course, the orthochromatic films will look different because of how they record color. The Efke ISO 25 and 50 films are ortho-panchromatic films, with reduced red sensitivity, so I don't think they can be developed with red safelight. There used to be an ortho Tri-X, but I don't think it's available anymore. That's all I know.
- Thomas
