Infrared heat?

[KadenL]

I know infrared can damage an animals retinas in the dark, but does anyone know if there is any kind of side effect or deformity stemming from infrared heat during incubation? I have a kind of different homemade incubator model I came up with a few years ago and would like to make it more energy efficient, as I'll soon be incubating either a pair of rhea or emu eggs within a week or so, and the emu eggs could take upwards of 55-58 days from incubation day 1 to hatching. I have searched but have seen nothing that would give infrared a bad rap for unborn fetuses, as pregnant women appear to be able to wear infrared muscle pain relief packs, but I'd like to be sure before I potentially risk the chick(s)' well being.

Thanks for any information!