Motion detector with led bulb

[nando]

Hi,
I have an outdoor security motion detector, since I replaced the incandescent bulb with an LED bulb, it does not work properly.
What would I have to do, to the detector to be able to use LED bulbs? Is it due to load?
Thanks in advance
Fernando

[pebe]

More information is needed. Is the LED the same voltage as the original lamp? Is the polarity correct?

[nando]

The LED bulb is a 115 v a/c same as incandescent bulb. Of course, the led is 15W where the incandescent bulb is 75w.
I think I need a rely controlled detector as opposed to scr