The LimoStudio 45 Watt CFL light bulb is of a spiral design and intended to fit photography/videography lighting kits, such as softboxes and umbrella lights with a medium screw base (E26/E27). It is a small to medium size CFL with a diameter of 3 inches and a length of 8 inches.
So, a 60 watt bulb emits 54 watts of heat, and 6 watts of light. A CFL uses less power for the same light by a factor of 3-4. meaning a 13 watt CFL will emit the same 6 watts of light -- giving off 7 watts of heat. TLDR; The wattage rating is for fire safety, you could use a 60W CFL in the socket, if you could find one of appropriate size.