Did a little research on light-therapy. Some have FDA approval, so guessing there has been more work done, besides the marketing department. Then again, sometimes I get the idea that the FDA will approve most anything for the right price...
The light sources are very narrow band and pretty high intensity (lot of laser treatment stuff). I don't think you'll obtain a high output, narrow spectrum source from ordinary fluorecent tubes with filters. Also might not be quite as safe with the increase in unwanted UV an IR. The near ultraviolet is suppose still kill bacteria, without the usual UV cancer risks.
The acne treatment doesn't sound to be highly effective, marginal at best. Only works on some types, and some people.