I worked with IR devices for 10 yrs and I can tell you the police don't own anything possible of seeing heat from a 400watt lamp. Unless you have it in your attic and if you live in a dry climate such as NM, AZ, NV then they will just think it's a swamp heater. Other sources of attic heat can be central air unit's, and attic stored hot water heaters.
You don't see through walls with that equipment. I could never see through walls with the equipment we used and the only people who have devices like that are military. Yes, they do have stuff that can push past the boundry of plaster and mortar. Although the military is out for bigger game. Plus they are not allowed to police the US by the Constitution. Thats why police have had such a hard time without the funding and support.
Hope that made ya feel better, now go get an super huge air freshner cause I can smell that BUD from here LOL