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: 100814346

Details

Are batteries included
No
Brand
Cyalume
Colour
Red
Container material
Plastic
Indoor/Outdoor usage
Outdoor
Item weight
458 g

⏳12-hour glow time

🔴360° red illumination

🪝hook & hole for versatile hanging

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2811760₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔴 Light up your safety game—because being seen is being ahead.

READY WHEN YOU ARE - Five-year shelf life means these light sticks are always primed for action, no maintenance needed.
SAFE SUSTAINABLE - Non-toxic, phthalate-free, waterproof, and recyclable materials for peace of mind and eco-conscious use.
ALL AROUND VISIBILITY - 360-degree illumination ensures you’re seen from every angle—perfect for emergency or outdoor use.
LONG LASTING RADIANCE - Up to 12 hours of bright, reliable red light to keep you visible and safe through the night.
EFFORTLESS ACTIVATION ATTACHMENT - Simply snap, shake, and hang with the built-in hook and hole—instant light, zero hassle.

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 and hole for easy hanging and boasts a five-year shelf life, making it a reliable, maintenance-free emergency lighting solution.

Specifications

ASIN	B010S58BNY
Batteries required	No
Best Sellers Rank	723,351 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 126 in Emergency Glow Sticks
Customer Reviews	4.7 4.7 out of 5 stars (780)
Date First Available	1 July 2015
Item model number	9-00721
Item weight	458 g
Product Dimensions	0.51 x 0.51 x 15.24 cm; 458 g

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2811760₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

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TrustScore 4.5 | 7,300+ reviews

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