Glass Lenses

UCL™ - Our "flagship" lens introduced in late 2002 is constructed from low-iron float glass (aka water-white) and has a mulit-layer broadband anti-reflective coating applied to both sides. The combination of water-white substrate and anti-reflective coating makes this lens a top performer and the only choice for those looking to achieve the best optical performance. Please note that UCL™ glass is ONLY manufactured by Flashlightlens.com and sold on this site or by an authorizerd reseller.
 
Light transmittance: 98% to 99%
Substrate: Low iron, water-white float glass
Coatings: Multi-layer broadband AR - 2-sides
Thermal durability: Good - typical of most glass
 
Borofloat® - Manufactured by Schott, this glass is Flashlightlens.com's workhorse. This glass is similar to Pyrex® in that it is a borosilicate type of material and able to withstand extreme thermal shock. That's where the similarities end. Unlike Pyrex®, this glass is manufactured using Schott's Microfloat process. This produces a piece of glass that's virtually flawless and has mirror-like surface quality. Since 2002, when Flashlightlens.com introduced this type of glass to the flashlight world, many manufacturers have seen the benefits of Borofloat® and now make this glass standard on their lights. It's outstanding mechanical, thermal, and optical properties make it a great choice for those not concerned with achieving that extra 5% of light transmittance that UCL® provides. This lens is also the preferred choice for those building "extreme" lights that produce high amounts of heat.

Light transmittance: 94%
Substrate: Microfloat borosilicate
Coatings: None
Thermal durability: Outstanding