What type bulb is in the light fixture? Incandescent, CFL, LED or Low Voltage Halogen?
Newer recess cans usually have a thermal overload... if it gets hot it may not switch open with absolute 'toggle' from on to off. I've observed several that simply start to open and the result is arcing across the internal contact of the overload. Some older lamp sockets are simply corroded which results in arcing.
A common cause of overheating is use of a bulb with to high wattage rating. Another is insulation too close to the fixture, trapping heat.
CFL bulbs are notoriously noisy in an RF sense. Some of the new LED bulbs are as well.
Last edited by GroundUrMast; 10-Oct-2012 at 3:19 AM.
Reason: sp
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