LEARNING CURVES. The hall light at the top of the stairs at Cold Spring Shops headquarters shows signs of impending failure. Remove housing. Unscrew light. Remember those original compact fluorescent lamps that resemble the burrito as big as your head? Yup ... that was what came out. It must have gone in there sometime in the last century. Original cost about $12. The replacement ... a 75 watt equivalent that will fit any space your standard Edison bulb will go, for under five bucks. We'll see how long it lasts.