Seems that some people like them, some don't. Whether you use them or not, they have a great new product guide online that has some really good info.
Tells a lot of basics about
lamps that some newbies to the business may not know. (and some of us that have been around a while can learn a few things as well.)
http://www.fstanning.com/pdf/Radianc...ct%20Guide.pdf