Likely the lamp. A photo eye usually shorts internally and the lamp stays lit 24/7. Odds are however after 12 years. The capacitor inside is on it's last legs. Depending on how long the fixture has been cycling a failing lamp. The ballast maybe half scorched as well. By the time you change a lamp and a capacitor.You are in the price of a 100% new fixture. With a new photo eye, new lamp, new ballast and new cap. As many new mercury vapour or metal halide ballast as you want to purchase up here. I would go with the metal halide as a plan B. Can't stand even a colour corrected high pressure sodium. For my last yard light I bought a 70W sodium vapour just to get the fixture, socket and photocell. I wired direct from the photocell to the lamp socket leaving the ballast/cap out of the circuit. Then threaded in a "day light" colour 150W equivalent compact fluorescent. In your situation I would find a big honking mogul base compact fluorescent or a mogul to edison base adapter. And connect direct from the photo cell and toss the ballast and cap away. If you look on ebay and online. There are huge compact fluorecents up to 500W equivalent.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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