What is the life shelf of the unopened Cyalume snaplight?

You all are going to think I'm making up stories, but I found a group of the Cyalume SnapLight sticks that was with some dry first aid materials that goes back to before Y2K. Perfect experiment, I thought. The green ones still glowed very brightly and although not bright were still visible 12 hours later. These things are really amazing.

Depends on your use... for brightness, without a doubt green. 2 reasons to get technical, first the chemical make up allows that color to glow brightest, and second is that the human eye sees this color better than any other light wavelength. If you're looking for "flares" though and need red, your best bet would be a strobe light. The red snap lights are good for low-light needs (hence using red lens flashlights in the military to read maps as the human eye doesn't pick this light up at low levels), but nowhere near what you would need for safety. Blues and whites are in the middle but don't nearly as long -better off with a LED flashlight. Go green...

Can they be stored in freezing temps in a car? Gets Brutal in NY in the winter

they can be stored in the car and they will not freeze

Will these give enough light to read if you need to find emergency phone numbers in phone book?

I was in a pitch black room door closed and no windows when I tried it out and I was able to find my locker and see the combination numbers on my lock. I thought it was pretty good. I'm sure you'd be able to see some emergency numbers in your phone book with this product. Hope this helped.

Cyalume Glow Sticks Military Grade Lightstick Premium Green 6 Snaplight

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Description

💡 Light up your safety game with military-grade glow power!

MILITARY GRADE TOUGHNESS - Trusted by US military personnel for dependable, high-output 360° visibility in any condition.
WATERPROOF NON FLAMMABLE - Safe underwater and in confined spaces—your go-to light when safety can’t be compromised.
UNMATCHED 12 HOUR ILLUMINATION - Stay lit through every emergency or adventure with a full half-day of bright, reliable light.
SAFER ALTERNATIVE TO ROAD FLARES - Non-toxic and durable, these glow sticks provide safer signaling without the hazards of traditional flares.
BULK PACK OF 10 FOR MAXIMUM READINESS - Always be prepared with a convenient 10-pack that ensures you never run out of emergency light.

The Cyalume Glow Sticks Military Grade 6” SnapLight offers a premium green chemical light that delivers up to 12 hours of continuous illumination. Designed to meet rigorous military specifications, this 10-pack is waterproof, non-flammable, and trusted by US military personnel for reliable 360-degree visibility in emergencies. Safer than traditional road flares, these glow sticks activate instantly with a simple snap, making them essential for tactical, outdoor, and emergency use.

Specifications

ASIN	B004NBZLJ2
Best Sellers Rank	#24,917 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #11 in Emergency Glow Sticks
Date First Available	January 11, 2008
Is Discontinued By Manufacturer	No
Item Weight	8.1 ounces
Item model number	9-08076
Manufacturer	Cyalume Technologies, Inc.
Product Dimensions	9 x 6 x 1.2 inches

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