They direct light in one direction (not all the light, but more in that direction and less elsewhere)
They are a little less efficient than normal tubes, but the internal reflector is better than than worn out optics of old Fluorescent luminaires, so in such applications (for top down lighting) they do have efficiency advantage
Discontinued as part of removing lamp choices in general. This is both an intended move to push users to LEDs one step at a time, and a result of dropping demands for the lamps
This is especially so for the reflector lamps since 1. the light distribution of some LED T8 tubes is identical to that of the reflector T8s and they cost much less (in tube price), 2. I think the reflector tubes were used mostly in new installs specified by professionals, but when tubes EOL, users tend to replace "special" lamps with ordinary lamps in general since they are cheaper and more widely available, and now T8s are not used much for new installs, 3. Users are conned into replacing away the luminaires that use the tubes
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