You have two issues that can cause this problem: The first could be bulbs not ment for the stress of outdoor use. The second is the motion detector. When using LED or CFL bulbs with a motion detector you MUST use "Dimmable" bulbs. Reason being, motion detectors tend to not deliver the full current to the bulbs and also will often flicker to almost on with minor motion that does not quite meet the "on limit" set. Incandescent bulbs don't mind this and simply flicker dimmly. But the electronics behind the LED and CFL bulbs burn up quickly if they are not designed to be dimmable.
The othe strange issue I've been having with LED bulbs used with my motion detecting flood out back is the detector has a built in timer. This timer works fine with incandescent bulbs, but shuts off at inconsistant times with LED or CFL bulbs installed. Anywhere from 3 seconds to never. I've tried all positions of the setting switch with the same results. (1 minute, 5 minute or always on)
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