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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Description

🔴 Light up your safety game—because being prepared never goes out of style!

COMPACT READY - 6-inch slim design fits anywhere—perfect for quick activation and easy storage in your emergency kit.
SAFE SUSTAINABLE - Non-toxic, phthalate-free, waterproof, and recyclable materials ensure safety for you and the planet.
360 DEGREE VISIBILITY - Glow in every direction with full-circle illumination and a built-in hook for versatile hanging or attachment.
LONG LASTING RADIANCE - Up to 12 hours of vibrant red light keeps you visible and safe through any emergency or adventure.
SHELF LIFE THAT IMPRESSES - Maintenance-free with a 5-year shelf life—always ready when you need it, no batteries required.

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 without batteries, making it a reliable, eco-friendly emergency lighting solution.

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