I’m not familiar with the “beta light” terminology, but from the website betalight.nl, it seems to be a tritium light source. What I’ve been using is a CC Universal Glow Marker. They are cheap relative to the price of tritium light sources. I have them attached to bags, door knobs and one is attached to my keyring.
'Beta light' was popularised by the SAS survival handbook, indeed a tritium light source. They are dim, so unless really dark and with direct eye sight, they ar enot that usefull. I think a few blackout lights like the Eton Blackout Buddy, can be more usefull and have emergency kit near a socket with such light.
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