When I was referring to artificial light, I really meant a picture taken at night with the only light source being of the artificial kind. I am not sure what that would look like in the IR spectrum although it'd be interesting to find out.
What kind of lens would you most recommend for IR shots? Primes maybe? Large aperture, etc? I did see the Sigma 10-20mm had an issue with hotspots so perhaps super wide angles/fisheyes are unsuitable.