If the glow is seen coming up from the horizon just before sunrise or just after sunset, however, you might be seeing something called zodiacal light.

If you've ever looked closely at your black dog in bright light after he has spent a lot of time in the sun, you will see a faint red glow to his hair.

Includes an After-Glow feature that keeps the el backlight turned on for a few seconds after the light button is released.