Mike and Teresa Justice are behavioral ecologists who conducted a study concerning the types of light bulbs that attract the most and least amount of insects. During the study, which took place over an entire summer, the pair set up a bug trap with one light bulb inside. Each night they changed the type of bulb and used controls for variances such as moonlight exposure and weather.
When the summer nights were over, the mornings yielded a grand total of 8,887 bugs. Types of light bulbs used in the study were incandescent, CFL, halogen, LED with cool color, LED with warm color and standard bug lights. To read the conclusions of the study, follow this link to Gizmodo.