I have a comparison Frances Baines posted elsewhere saved from some research I did earlier:
These are all in plain fixtures, no reflectors, no mesh. UV Index readings with
Solarmeter 6.5.
24" long, 18watts, T8 Zoomed Reptisun 10.0:
at 8" - UVI 1.4
at 10" - UVI 1.1
at 12" - UVI 0.8
24" long, 18watts, T8 Arcadia D3+ 12% Reptile:
at 8" - UVI 1.7
at 10" - UVI 1.3
at 12" - UVI 1.0
22" long, 24watts, T5 Arcadia D3 6% Reptile:
at 8" - UVI 2.2
at 10" - UVI 1.7
at 12" - UVI 1.4
22" long, 24watts, T5 Arcadia D3+ 12% Reptile:
at 8" - UVI 4.2
at 10" - UVI 3.1
at 12" - UVI 2.4