I bought a Thomas safelight off Ebay recently. Mine has yellow filters. Did a safelight test with Kentmere FP VC paper this weekend. I flashed the paper with the subthreshold exposure from the RH Designs paper flasher and then exposed the paper to the safelight at the average distance for 7-8 minutes. Major fogging. I had the windows of the safelight mostly open so it was very bright. I did not have time to test it with the windows down.
My darkroom is 8 x 16 feet and I placed the light in the far corner, near the ceiling, with the light bounced off the white ceiling. Will probably need to close the safelight windows to greatly reduce the light output. Too bad. It was so bright in there.