You can use a low wattage bulb with a red gel covering it. Red LED works ok as well but I recommend a diffuser of sorts as LED's are 100% directional and intense. Fluorescent bulbs do emit ultraviolet energy which is probably bad for long term glider eye health, so stay away from tubes and spirals.
Night creatures are not bothered by red light; Supposedly they do not have the cones to see red, just blues and greens, so they are dichromatic. They could even possibly be monochromatic or colorblind. They may have rods only in their huge eyes which could account for how easily they are startled by movement near or far as they would have poor spatial accuity.