Does anyone know what the max temp for 20 watt 17" flexwatt?

Reason I'm asking is becuase I just set up my rack with what was supposed to be 17" 20 watt flexwatt, wired in to a dimmer switch. Right now the dimmer is as high as it can go, and I'm getting a reading of 91°F. The flexwatt itself has the zig-zag pattern to it, not straight lines like I've seen. Did i get screwed and was sent older stuff? Is my wiring messed up? or is this really as hot as it gets?