Reptile lights only provide 5% uvb which is what you want so basically 5% sucks,use proper tanning tubes which can produce uva or uvb,use the uvb tubes only and youll see ten times more difference than a reptile light.
At this moment i am searching to find out if i can fit a 100watt uvb sunbed tube into a standard 100watt fluro fitting,of the correct length.
Here is a list of tubes that i found:
LONG LIGHT - Low Pressure Tubes (UVB)
Code Type Description Power(W) Length (L) UV-A mW/cm2 UV-B/UV-A Diameter (D) MPI14943 07.80 Tube ISO Light 80 W R07 80 1500 20 0,7 600 MPI14942 07.100 Tube ISO Light 100 W R07 100 1760 24 0,7 600 MPI14938 10.80 Tube ISO Light 80 W R10 80 1500 20 1,0 600 MPI14939 10.800 Tube ISO Light 100 W R10 100 1760
24 1,0 600 MPI14940 13.80 Tube ISO Light 80 W R13 80 1500 20 1,3 600 MPI14941 13.100 Tube ISO Light 100 W R13 100 1760 24 1,3 600 MPI14945 13.140 Tube ISO Light 140 W R13 140 1500 32 1,3 600 MPI14946 13.160 Tube ISO Light 160 W R13 160 1760 38 1,3 600 MPI14924 16.80 Tube ISO Light 80 W R16 80 1500 20 1,6 600 MPI14926 16.100 Tube ISO Light 100 W R16 100 1760 24 1,6 600 MPI14925 16.140 Tube ISO Light 140 W R16 140 1500 32 1,6 600 MPI14927 16.160 Tube ISO Light 160 W R16 160 1760 38 1,6 600 MPI14947 19.80 Tube ISO Light 80 W R19 80 1500 20 1,9 600 MPI14948 19.100 Tube ISO Light 100 W R19 100 1760 24 1,9 600 MPI14928 19.140 Tube ISO Light 140 W R19 140 1500 32 1,9 600 MPI14929 19.160 Tube ISO Light 160 W R19 160 1760 38 1,9 600