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This light is under the 300 watt hours that TSA requires.  You can take this as a carry on. 

EX:The 20amp version puts out only 197 watt hours.

This Lusca 21 Watt LED is powered by a 20 amp Li-Po rechargeable battery pack providing 8 hours of burntime. The 21 Watt LED emitter outputs 1100 lumens at 5600 kelvin on full power. The emitter is rated at 50,000 hours and has a 6 degree focus beam. New Dry Lid is completely sealed providing protection from water intrusion due to a cut cord or switch boot.Battery Canister is completely sealed preventing water intrusion due to improperly latched lid or forgotten o-ring. Dry Weight is 7 lbs.(3.2kg) 3 lbs(1.36 kg) Negative. Recharge Time from Complete Discharge is 12 hours. Universal Input Charger. US Input Cord Provided, UK and European Input Cord Available. The canister is machined from Solid Rod of Delrin and the light head is black anodized aluminum. The light head is 2"(50mm) in diameter and 4"(100mm) in length. The canister is 10"(253mm) Length, 3.5"(88mm) Diameter. Comes complete with goodman handle that can be used in a hard or elastic mode.

LED's generate heat when operating and if the Lusca 21 watt LED is used out of the water for more than 5 minutes it will drop to a lower power setting to prevent overheating. Turning the light off and back on will reset this safety feature.