81% to 17% VLT Auto Tinting Timed Performance Windows

MCR Safety VL2 Photochromic Safety Glass provides the industrial worker with a single option for many lighted environments. This auto tinting performance technology shifts from clear to gray in 30 seconds and will migrate from gray to clear in 180 seconds. This will allow you to work in applications that move from indoor to outdoor settings or extreme light settings to low light settings by eliminating the need to remove your safety glass to see safely.Coated withMAX6 Anti-Fog protection for 6 times better fog resistance than standard anti-fog.

When transitioning from clear to gray

(5-second increments)

As you can see from the numbers below, it does not take long when transitioning from clear to gray:

• At 0 seconds, there is84.8% VLT
• At 5 seconds, there is48%VLT
• At 10 seconds, there is28.5% VLT
• At 15 seconds, there is20.5% VLT
• At 20 seconds, there is18.4% VLT
• At 25 seconds, there is16.8% VLT
• At 30 seconds, there is15.8 % VLT

VLT, when a lens is at full gray, is more of a medium gray due to it not reaching a complete 13% VLT.

When transitioning from gray to clear

(10-second increments)

One thing stands out from the numbers below: it takes longer to reach clear going from a gray lens. Here are the VLT measurements as they transition:

• At 0 seconds, there is14.4% VLT
• At 10 seconds, there is20.3% VLT
• At 30 seconds, there is33.7% VLT
• At 40 seconds, there is39.6% VLT
• At 50 seconds, there is44.7% VLT
• At 60 seconds, there is48.9% VLT
• At 70 seconds, there is53.5% VLT
• At 80 seconds, there is57.1% VLT
• At 90 seconds, there is60.1% VLT
• At 100 seconds, there is62.7% VLT
• At 110 seconds, there is64.9% VLT
• At 120 seconds, there is66.8% VLT
• At 130 seconds, there is68.4% VLT
• At 140 seconds, there is69.8% VLT
• At 150 seconds, there is71% VLT
• At 160 seconds, there is72% VLT
• At 170 seconds, there is72.8% VLT
• At 180 seconds, there is73.5% VLT

To reach an84.8%VLTclear lens, a lens will take a total of 5 minutes of transition time. So, anyone needing fast-acting clear glasses should maybe think twice about selecting a photochromic lens.

Photochromic lenses are temperature-dependent, which means transitional performance varies. So, it’s important to remember these two factors when thinking about transition time:

• Photochromic lens performance is affected by local hot temperatures and humidity, meaning the safety glass' lens will not be as dark.

• Photochromic lenses for glasses are more effective in colder temperatures, meaning the safety glass lens will get darker.