Yes and no. Pending
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A: Photocell and LED cannot work directly because these are different devices. But yes each independently can work as a unit all you need is some buffering.
The simple answer is, NO one should work with live electrical parts.however, testing live part, so long right test tools and methods are followed is OK.after training and experience in the field, electricians judge how fan one work with live parts. not saying they do work with live parts. but they know how to work around live areas and cutting the power off areas they must work with without the disturbance of any other area.
Yes. He has the required knowledge, skill and ability. All he needs to go to work is the appropriate license for the area in which he wishes to work. This may be a business license, handyman's license or a contractor's license.
Each fixture will have to have it's own motion sensor, then yes it will work.
power surge. happens all the time