It has been my unfortunate experience that these light fixtures can have any number of bulb types installed. The best way to be sure is to pull a bulb and examine it. If the bulb was installed by a manufacturer it will have printing designating the type.
It might be a bayonet or wedge base. If you are concerned about the color, that is measured in kelvin. 4,000 - 5,000 kelvin is closest to incandescent bulbs. If you want a light that replicates a parking lot, 6,500 kelvin and above. If you get too high a kelvin, 8,000+ the light will be bluish. Posted below is the bulb types available from etrailer as an example of types only. Bulbs I typically buy from a specialty lighting store in order to be sure it is a proper match and high quality.
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