  
After just 20 minutes the Lightstick starts to dim down at a constant rate.
Krill 180 50 Hour Extreme Green Compared to a 8" 12 Hour Green Glowstick. The Krill 180 Extreme Series Lamps light output will remain the same for 50 hours.
The Krill Long Life series Lamps will have slightly less light output but will remain illuminated for up to 120 hours of constant use or several months on intermittent use before batteries need to be replaced.
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