I had to replace an Advance RQM-2S40-3-TP which is no longer made by Advance. After some searching I came across Universal Lighting. Technologies B234SR120M-A000I Electronic Ballast Fluorescent T12 2 Lamp 120V I wasn't sure if this would work as a replacement. Based on a person's review (or maybe their answer to the question) the person wanted to do the exact same thing I did and said it worked. I received the product, installed it and voila, everything worked! I've ordered 3 more because I don't know if this will ever go out of production. My lamps are over 25 years old. I don't want to change all the lighting just because the ballasts eventually run out. I don't risk it, especially since the price is cheap.