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.

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🔥 Light up your mission with 12 hours of unstoppable red glow!

READY WHEN YOU ARE - Lightweight and disposable, these sticks are your go-to emergency companion—always reliable, always bright.
SAFE FOR EVERY SITUATION - Waterproof, non-flammable, and non-toxic chemistry means you can trust SnapLight anywhere—from underwater to confined spaces.
GLOW THAT OUTLASTS THE NIGHT - Patented formula delivers a powerful red light for a full 12 hours—no batteries, no fuss.
BUILT TO BRAVE ANY ENVIRONMENT - Industrial-grade construction ensures these sticks withstand tough jobs and harsh conditions.
MADE IN THE USA TRUSTED WORLDWIDE - Crafted with precision and quality control for professionals who demand the best.

Cyalume SnapLight Red Glow Sticks are 6-inch industrial-grade light sticks engineered for ultra-bright, 12-hour illumination. Featuring patented, waterproof, non-toxic, and non-flammable chemistry, these durable sticks excel in emergency, industrial, and underwater applications without requiring batteries. Made in the USA, they combine safety and reliability for professionals who need dependable light anytime, anywhere.

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Manufacturer	Cyalume
Part number	9-08002
Item Weight	230 g
Product Dimensions	2.54 x 2.54 x 15.24 cm; 230 g
Item model number	9-08002
Colour	Red
Style	Modern
Material	Paraffin Wax
Pattern	Solid
Shape	Round
Item Package Quantity	1
Special Features	Non Toxic
Specific uses	Emergency, Industrial
Batteries included?	No
Batteries Required?	No

Cyalume SnapLight Red Glow Sticks - 6 Inch Industrial Grade, Ultra Bright Light Sticks with 12 Hour Duration (Pack of 10)

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