It depends on the lights you use. You want the light to slightly overlap the other lamps.
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Based on the height of the ceiling the lights can be placed at half the distance. For a ceiling of 14 feet, the lights should be at 7 feet.
Fluorescent lights use far less energy than any of the others listed.
Most truss systems are spaced 24 inches on center. Depending on the length, or load applied they will sometimes need to be spaced 16 inches on center. Trussed Rafters as advised by TRADA are now spaced at 600mm c/c.
Code requires that the resistance between the two grounding electrodes be 25 ohms or less. You don't mention how deep they are or how far apart they are. THat will make a difference. Or it could be the soil they are in.You need to get the resistance down
How far do u put a GFCI receptacle from water