The short answer is no you can't see true ir, your bulbs are producing IR but also red light as they are very close together a CHE of the same wattage will produce more heat and less (no) light. No the red light will not bother your snake.

Long answer...

This is a bit academic here. Snakes absolutely sense IR, 'see' isn't quite right, it isn't visual but with the heat pits. Does IR sources bother them no it doesn't seem to. If you are seeing light from your bulbs (dark red right...) The visual spectrum is a little part of the electromagnetic spectrum. ... microwave, infrared, visual red, orange, yellow, green, blue, violet, ultraviolet, x-ray... There is a bit of a cross over at the junctions IR to red. You are seeing the crossing point. This also means that the bulbs you have are not deep in the IR range but the 'near' IR and are not producing very efficient heat. Again academic as it works so how cares? CHEs are in the deep IR range and produce no light only heat the light in this case is a bit of a by product and not really useful but hey you can check on what your snake is doing in the night.