Review on Eiko 15501 Fluorescent Linear Phosphors: Optimizing Illumination Efficiency by Adam Walsh

I had a hard time finding a tube this size for an old slotted beer sign. I was grateful to have found this one and found the contacts and lamp length to be perfect. The only issue I had was that the metal end caps that held the pens were quite thick (slightly larger in diameter than the glass tube). This made installation difficult as this metal edge prevented the pins from fully engaging the socket. In the end I managed to gently twist the bulb into position and it works fine. So if you need to fit this bulb in tight spots, it can be a problem. If you have a big gap around the pin socket, you won't have a problem.