Zircon is a new concept in LED filter design that has been designed from the ground-up for exceptional performance with LED Lights.
LEE Zircon – Longer life filters for LED
In fact, Zircon Warm Amber filters have been shown to retain at least 80% of their effectiveness after as much as eight months of continuous use on LED downlighters.
Not only are Zircon filters longer-lasting than their standard counterparts, they’re sturdier, too.
Manufactured using an 180-micron material, they are more than double the thickness of a normal lighting filter. This makes them more durable and easy-to-use.
Find more about Zircon at http://www.leefilters.com/lighting/zircon.html