Exactly what i wanted to say too e57.
Let the photocell control a contactor which can control the lights over 2 or 3 phases.
Also the current rating of these photocells is not that high, (10 Amps) An excessive load, which may cause the contacts to fuse together when overloaded. bear in mind the inrush currents of ballast lamps, SON is quite often a lot higher than the running current when warm.
Check with the info on the lightcell box, packaging, what the current rating is and which wire is incoming phase, load, and neutral.
