Your question is an oxymoron, or at least a contradiction of terms. All the coach lights with integral motion detectors and or photocells are of Chinese mfg. and subject to work until they quit. Lightning arrestors at the panel help, 130 volt bulbs help, but a remote mounted, domestically mfg. photoocell that is not pointing at the sun is the most practical solution. Photocells are light sensitive(Duuuhh!) devices and the fine print suggests not placing them on the sunny side of the structure. The fixtures that contain the devices offer no protection or warning to the installer that sunlight will cause the pc to fail.