That concerned me too but it doesn't have a lens. It's just an opening in the housing. I did put a #63 bulb in it. That's the lowest output BA15 base 6v bulb I could find. I also made sure the light is pointed down and away from the driver. I haven't actually had the chance do use it at night yet. If necessary I can probably put a piece of red mylar over the opening to dim it a bit. Time will tell.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.