He's asking if the light bulb is a tube (long and fits in a hood like an aquarium light) or is it bent around and fits in a regular light bulb socket. The bent ones are too powerful and may blind your chameleon.
I use UBV10 long fluorescent bulbs with my veiled and my jacksonii and they both seem to work well. Both of my chams are thriving. I guess it's a matter of taste for the keeper. I have read that UVB5 bulbs are the best, yet my boys are doing very well under the 10s I use. Just a thought.
If it does look like the photo then yours could either be an ESU or R-Zilla brand. When the tubes were made by ESU, they didn't have a very effective spectral content of UVB even though labeled 8%. It is a nice looking fixture but the phosphor used in the tubes just didn’t work nearly as well as the ZooMed Reptisun 5.0 tube (typically 18 inches long). ESU was merged into a new company and the product line became R-Zilla. They reformulated their phosphor trying to produce 50uW/cm2 output at 12 inches and no longer referred to a percentage number like 8%. Unfortunately the new formula not only produced the UVB that we want but also produced levels of UV energy outside of the safe spectrum for your chameleons (or any other living thing). This highly biologically active spectral content quickly began injuring and/or killing chameleons. I was part of the team that got the R-Zilla Tropical 50 product "removed" from the marketplace. R-Zilla told their manufacturer in China to reformulate the phosphor. R-Zilla will send a sample of the new product directly to the research people that I used. It will be tested and an announcement will be made as to its safety and effectiveness. This hasn't happened yet so there may still be some of that old phosphor formula out there even though they could have returned it all to R-Zilla for a full refund. You mentioned 8% so you probably have the old ESU model. If you can get a ZooMed Reptisun 5.0 tube (made in lengths from 15 inches to 48 inches) then do it. The ESU and the R-Zilla tubes are to be avoided for now. If you can't get the Reptisun 5.0 linear (not compact) tube, let us know what other choices you have and we will help you pick one.