# FACTS on HIDs/Projectors

**URL:** https://forums.speedlife.net/t/facts-on-hids-projectors/26223
**Category:** NYSpeed Automotive
**Created:** [March 21, 2007, 8:48am UTC](https://forums.speedlife.net/t/facts-on-hids-projectors/26223 "2007-03-21T08:48:35Z")
**Posts on this page:** 1
**Showing post:** 22

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### Author: ![tweety](https://avatars.discourse-cdn.com/v4/letter/t/51bf81/32.png) [@tweety](https://forums.speedlife.net/u/tweety)
#### Post date: [March 21, 2007, 12:33pm UTC](https://forums.speedlife.net/t/facts-on-hids-projectors/26223/22 "2007-03-21T12:33:39Z")

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All that blue light is the refractive index of the glass varying with the wavelength of the light, which makes the coloured fringes .  
A bit of coating on the lens would get rid of that, or some better glass- LOL

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