HONOLULU (KHON2) — There are more and more homeowners who are installing blue lights outside their homes. But blue lights are not necessarily good for the animals with whom we share our world.

Last fall, Sheetz, a convenience-store chain with more than 500 stores in six states, installed a new lighting system in the restroom of its New Kensington store, about 20 miles outside Pittsburgh.

It’s tough to prove the effects of blue light on humans, for many reasons. For one thing, we actually need a little blue light in order to keep our eyes healthy.

Blue light and sleep. Light affects your circadian rhythm. In the morning, light signals to your body that it's time to wake up, which is why you tend to be more alert during the day.

Blue light and sleep patterns. Fluorescent and LEDs bulbs create a two-fold problem when it comes to sleep. First, they produce artificial light.

They are also another type of safety device you can find in outdoor parking lights. Similar to Lot Cops, the blue light is meant to serve as an easy indicator that the emergency phone is there so ...