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

Is the shape like an octagon to avoid rolling on a flat surface?

Seems to not roll due to flat sealed end not to say it would not roll on a steep incline hope this helps

Are these Coast Guard approved instead of light them up flares?

I can't give you any kind of legal advice ("...approved by Coast Guard..."), but I'd suggest to you that the soft and gentle glow of a Cyalume Stick would be quite close to useless if you were stranded out on the water and were waiting for the Coast Guard - anyone - to find you.

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Cyalume 9-00721 Snap Light Stick, 6", Red (Pack of 20)

Product ID: 323416939

Details

Are batteries included?
No
Brand
Cyalume
Colour
Red
Indoor/outdoor use
Indoor
Item weight
1.01 Pounds
Number of Items
20

📏6-inch compact size

🔴12-hour bright red glow

🪝360° illumination with hook

Description

🔦 Light up your safety game—because being seen is being ahead!

COMPACT READY - 6-inch size fits anywhere—snap, shake, and shine instantly for on-the-go emergencies.
360 VISIBILITY - Full-circle illumination with built-in hook for versatile hanging or attachment.
SAFE SUSTAINABLE - Non-toxic, phthalate-free, waterproof, and recyclable materials for peace of mind.
LONG LASTING RADIANCE - Up to 12 hours of vibrant red light keeps you visible and safe through the night.
SHELF LIFE THAT IMPRESSES - Maintenance-free with a 5-year shelf life—always ready when you need it most.

The Cyalume 9-00721 Snap Light Stick is a 6-inch industrial-grade red chemiluminescent light providing 360-degree illumination visible up to a mile away for up to 12 hours. Waterproof, non-toxic, and phthalate-free, it features a hook for easy hanging and boasts a 5-year shelf life, making it a reliable, maintenance-free emergency lighting solution for professionals and outdoor enthusiasts alike.

Specifications

ASIN	B010S58BNY
Additional Features	Non-toxic,Waterproof
Batteries are Included	No
Brand Name	Cyalume
Candle Type	Taper Candle
Color	Red
Container Material	Plastic
Container Type	No Container
Customer Reviews	4.7 4.7 out of 5 stars (1,897)
Indoor Outdoor Usage	Indoor
Item Diameter	6 Inches
Item Dimensions W x H	15.2W x 15.2H centimeters
Item Weight	1.01 Pounds
Manufacturer	Cyalume Technologies
Manufacturer Part Number	9-00721
Material Features	low density, phthalate free
Material Type	Wax
Material Type Free	Phthalate
Model Number	9-00721
Number of Items	20
Occasion	Emergency
Package Size Name	20 Pack
Packaging Type	Individually Wrapped
Product Style	Industrial
Scent Name	Unscented
Seasons	All Season
Shape	Cylindrical
Size	20 Pack
Specific Uses For Product	Emergency
Target Audience	Emergency responders, campers, and outdoor enthusiasts
Theme	Emergency Preparedness
Unit Count	20 Count
Wick Quantity	1

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