DO NOT BE FOOLED BY EXPIRATION DATES!! THE UNITED STATES GOVERNMENT REQUIRES MANUFACTURERS TO PUT AN EXPIRATION DATE ON EVERYTHING THAT IS MILITARY-SPEC - MILITARY GRADE. 

WHAT KILLS LIGHT STICKS AND REDUCES EFFICIENCY - IF ANYTHING-

IS EXTREME HEAT (120° F+) AND COLD ( -0°F OR BELOW)....NOT AGE!!

We have used these 5 years after expiration and they work fine

30 minute glow
Made in the USA
Weatherproof