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.