This should help. I put a checkbook by it.
The light weighs 1lb and 5oz with 4 18650 protected KeepPower 3400mah batteries in it.
Features of Fenix TK75:
• Utilizes three Cree XM-L(U2) LEDs with the individual reflector respectively with a lifespan of 50,000 hours
• Uses four 18650 rechargeable Li-ion batteries when needed but also can be powered by two 18650 rechargeable Li-ion batteries
• Incredible 606-meter beam throw • Output mode / Runtime:
Turbo: 2600lumens / 1h 15min
High: 1100 lumens / 4h
Mid: 400 lumens / 12h
Low: 18 lumens / 200h
• Dimensions and Weight:
Length: 7.28" / 185mm
Diameter: 2.07" / 52.5mm
Head Diameter: 3.45" / 87.5mm
Weight: 18oz / 510gm
• Digitally regulated output - maintains constant brightness
• Over 8-day run time, suitable for long-time searching • Over 80-degree flood beam angle to provide a panoramic view • Reverse polarity protection, to protect from improper battery installation
• Over-discharge protection circuit, protect the rechargeable batteries effectively
• Intelligent Memory Circuit
• Over-discharge protection circuit
• Low-voltage warning function to alert users to replace the batteries • Capable of standing up securely on a flat surface as a candle
• Run time can be extended with the addition of a body tube segment and battery holder (sold as an accessory kit). Run time will double with each segment-holder addition but brightness levels will not change.
• Made of durable aircraft-grade aluminum
• Premium Type III hard-anodized anti-abrasive finish
• Toughened ultra-clear glass lens with anti-reflective coating
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I have that Browning clip on light you are talking about. It does ok. There are other headlamps that are a lot brighter. But for turkey hunting that Browning LED clip on light is really all you need.