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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🔴 Snap, glow, and own the night with Cyalume!

ALL AROUND GLOW - 360-degree illumination ensures you're visible from every angle
READY WHEN YOU ARE - 5-year shelf life means no last-minute scrambling
SAFE SUSTAINABLE - Non-toxic, phthalate-free, and recyclable for peace of mind
VERSATILE ATTACHMENT - Hook and hole top for easy hanging or securing on the go
LONG LASTING VISIBILITY - Stay seen for up to 12 hours with industrial-grade brightness

The Cyalume 9-00721 Snap Light Stick is a 6-inch industrial-grade red 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 durable plastic body with a hook for easy attachment. Each stick has a 5-year shelf life and is individually foil-wrapped to maintain peak performance, making it a reliable, maintenance-free safety light for professionals and adventurers alike.

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