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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🔵 Light up your world, stay ready, and never be left in the dark!

UNMATCHED 8 HOUR RUNTIME - Keeps your space lit through the longest emergencies or outdoor adventures
WATERPROOF NON FLAMMABLE - Safe for underwater use and confined spaces—no sparks, no worries
ELITE MILITARY GRADE BRIGHTNESS - Trusted by US military for reliable 360° illumination in any environment
SAFER ALTERNATIVE TO ROAD FLARES - Non-toxic, durable chem lights that protect you and your crew without the hazards
BULK PACK OF 10 FOR MAXIMUM READINESS - Always be prepared with a ready-to-go set that covers all your safety needs

CyalumeSnapLight Blue Glow Sticks are industrial-grade, military-spec chemical light sticks that deliver ultra bright blue illumination for up to 8 hours. Waterproof and non-flammable, these 6-inch glow sticks come in a convenient pack of 10, making them ideal for emergency preparedness, tactical use, and outdoor activities where reliable, safe lighting is essential.

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€ 84.43

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Netherlandsstore

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Manufacturer	Cyalume
Part number	9-08003
Item Weight	230 g
Product Dimensions	22.23 x 8.26 x 7.62 cm; 230 g
Item model number	9-08003
Size	10 Count
Colour	Blue
Shape	Duration: 8 Hour
Wattage	20 watts
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

CyalumeSnapLight Blue Glow Sticks - 6 Inch Industrial Grade, Ultra Bright Light Sticks with 8 Hour Duration (Pack of 10)

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