How does the Yellow Bug-Lite Work? Insects and humans have different visual perceptions. This allows for people to have better control of nocturnal insect nuisances by adjusting the color of lighting.
The human visual system is activated by radiant energy in the color range from deep blue to dark red, which we call light. The vision of flying insects, however, is shifted away from long-wavelength red toward the shorter blue and near ultraviolet (black light) wavelengths of the electromagnetic spectrum. Sources which radiate ultraviolet energy and blue light are most attractive to flying insects, while those with a deficiency of ultraviolet and blue are less attractive. Insects see black light fluorescent, mercury, and metal halide best. Lamps which insects have a difficult time seeing include incandescent, high-pressure sodium, and bug light incandescent (yellow).
RESIDENTIAL AREAS
Homeowners can reduce insect annoyance by using incandescent "bug lights", gold fluorescent, or high-pressure sodium near entrances. Unfortunately none of these sources render complexions, flowers, or greenery very well because of their lack of blue light. In addition, any light source near doorways should be shielded from horizontal view so that the flying insect will be less apt to see it. If possible, the light source should be located a short distance from the entrance and the light should be directed to illuminate the entrance. Note that incandescent "bug lights" do not repel bugs - they just don't attract as many as plain bulbs because the insects cannot see the yellow light as well as they can see blue or ultraviolet light. Another tip is that decks, patios, and particularly barbecue and eating areas should be lighted from a distance. The custom of stringing colored bulbs for a festive atmosphere will work reasonably well if the majority of light in the area is beamed in from some distance away.
