Although there may seem to be sure reason, there is actually no single scientific explanation for this behavior.
For some insects, a bright light source is seen as a emergency beacon. When in doubt, they will instinctively head for the light, which is generally higher than their current danger-filled position.
Another popular theory is that insects attracted to light use it as a navigational aid
The difference between insects attracted to light and insects not attracted to light is a phenomenon known as phototaxis. Certain insects such as cockroaches or earthworms have negative phototaxis, meaning they are repelled by exposure to light. Moths, flies and many other flying insects have positive phototaxis, meaning they are naturally attracted to light.
There are a few theories about this however, no one concrete proven theory. Insects are attracted to light because it is generally at a higher position than they are flying, so flying away from the light would be flying into dark/dangerous areas. Another reason might be that insects use natural light to know which direction they are flying, however they might not be able to tell the difference between the sun/moonlight and our manmade light bulbs.
Some insects have their antennae so designed that they are sensitive to light and so fly in its direction. These are mainly diurnal insects as against the nocturnal insects such as cockroach which detest light.
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