Are insects attracted to near infrared light?
In general, insects are most attracted to UV light. If you switch to a light source without UV-light, the amount of insects attracted will reduce to almost zero.
It has been hypothesized that this sensitivity to UV-light is because direct light sources (sun, moon) contains more UV than objects that reflect light. In this way, it may help insects to distinguish between open spaces and shelter.
It has long been thought that insects are blind to red and IR light. However, there is evidence that some insects do see, and are attracted to, IR light, at least up till 740 nm. However, red or IR light will attract far less insects compared to ypur incandescent light source.