I recently was given a nearly complete darkroom setup by a friend that included a "Yankee Safelight SL-2". On the label, it says "110 volt 15 watt". The bulb that was in it was a Sylvania NO. 140 75w-120v and it seems to get awfully hot awfully quickly. I bought a compact florescent 19w 120v bulb (supposedly equivalent to a 75 watt incandescent bulb) to replace it (and hopefully run cooler). Any ideas or suggestions?