Would I be able to go free diving with this in a state park spring?

Great day Zachary, Great question,Yes you can, Factory short description;Cyalume's industrial grade 6 in. SnapLights provide 360 of illumination. They are foil wrapped for light/moisture protection, maintenance free, non-toxic, non-flammable, and waterproof.A customer in San Diego, CA stated; A must have to keep around for emergencies, also good for the kids at parties, in campers, on boats,etc.We zip tie them to our scuba dive gear when we do night dives a great safety light!Thanks for asking, RiccaPlanet

I saw a military grade version that only last for 30min. How come these lasts for hours?

There are different grades of light sticks for different uses. The 30 min you saw where rated as High Intensity, those last for approximately 30-45 minutes at the maximum output. There is also an Ultra-High Intensity version which lasts for only a few minutes. Those are rated for 5 minutes of maximum output. They either put in a catalyst to speed up the reaction in the high intensity sticks or an inhibitor in the longer time sticks. The longer the time on the stick, the less light output. I hope that helps.

I understand the use for all the colors but blue. What are these for?

Blood shows up under blue light better.

Do these have an expiration date? I'm thinking of putting them in my disaster kit.

Yes they do. The packs I bought early 2015 have the expiration date of 11/19 so they last over four years at least. They work great. Hope this helps.

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Cyalume Glow Sticks Military Grade Lightstick - Premium Blue 6” SnapLight Emergency Chemical Light Stick with 8 Hour Duration (Bulk Pack of 10 Chem Lights)

Product ID: 2324165

Details

Brand
Cyalume
Included Components
Lightstick
Item Weight
0.22 kg
Item dimensions L x W x H
8.75 x 3.25 x
Manufacturer
Cyalume Inc.
Material
Plastic

⏳8 Hour Long-Lasting Light

💧Waterproof & Non-Flammable

🔵Premium Blue Glow

SAR 135

Duties & taxes included

In stock

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Description

🔦 Light up your safety game with military-grade glow power!

BULK PACK OF 10 - Always be prepared with a ready supply for any situation.
SAFE WATERPROOF - Non-toxic, safe underwater and in confined spaces—flare alternative you can trust.
INSTANT ACTIVATION - Snap, shake, and light up your surroundings in seconds—no batteries needed.
EXTENDED 8 HOUR GLOW - Keeps you visible and safe through the longest emergencies.
MILITARY GRADE RELIABILITY - Trusted by US military for 360° tactical illumination.

The Cyalume 6” Premium Blue Military Grade Glow Sticks come in a bulk pack of 10, delivering ultra-bright, 8-hour illumination that meets strict military standards. Waterproof, non-flammable, and safe for underwater use, these chemical light sticks provide reliable, instant light activation without batteries—ideal for emergency, tactical, and outdoor scenarios.

Specifications

ASIN	B004NBZLJC
Best Sellers Rank	#21,828 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #14 in Emergency Glow Sticks
Brand Name	Cyalume
Customer Reviews	4.5 4.5 out of 5 stars (1,325)
Included Components	Lightstick
Item Dimensions	8.75 x 3.25 x 3 inches
Item Weight	0.22 kg
Manufacturer	Cyalume Technologies, Inc.
Manufacturer Part Number	9-08003
Material Type	Plastic
Model Number	9-08003
Number of Items	10
Number of Pieces	10
Set Name	Bulk Pack of 10
UPC	852845001113
Unit Count	10 Count
Warranty Description	Na.

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