A typical cone light.  Yellowstone Park staff has established that these lights are historically accurate for the Park and will be using lights of this type.

Shield for glaring reflector floods.  Yellowstone Park is giving these a try for their bare floodlights.  Parshield ® http://www.parshield.com/

This is a typical “light bulb in a glass box” light that looks good in the day and in the store, but looks like a bare light bulb at night.  The ordinance allow these if the bulb is no brighter than a 60 w bulb if the glass is frosted or smoked.  A easy solution for an existing light is to put a reflector floodlight in a down-facing socket as these have, so that the light goes down and the bulb isn’t in  people’s eyes.

This fixture is acceptable if no brighter than a 60 watt light bulb because it is frosted and diffuses the light to reduce glare.  For the stars, it is bad.  It shines almost as much light up as down.  It should be used only under an overhang.