Outdoor lamp dimming part of lighting circuit

[ncoups]

I've got an outside pir lamp at my house, its only got a low energy bulb in, its not a security lamp. When it operates, the lights in the lounge dim. It cant be overloading the circuit, theres not that many fittings on it.
Could it be a bad connection? there's laminate flooring where I suspect the connection to be so im hoping not.
Cheers

 

[ericmark]

If wired correct it should not be able to dim your lights due to overload as the fuse or trip should go first.
There must be a wiring fault somewhere. It could as you say be bad connection but I would also suspect incorrect wiring.
But it does need investigation as a bad connection can be a fire risk.