When the lid is all the way tight the light won't function. I purchased two of them the other one works fine it's...the lid not grounding? Any advi

Mine does this too. The light has what I believe to be a magnetic switch inside, and it is sticky. Turn the light to the on position and strike the back of the light hard with the heel of your hand. Works for me.

Is it good in green water?

I use it while working in rivers and lakes. It works great for the murky water I’m using it in.

Is zoomable? Does the light beam zoom?

IF YOU MEAN BY ZOOM-ABLE, THAT THE LIGHT CAN BE ADJUSTED TO GO FROM A WIDE PROJECTION TO A SMALLER MORE CONCENTRATED BEAM - THE ANSWER IS NO

How many hours can i get from the light?

I used it very often but not for a long time. I don't know how many hours. But i am very happy of it. very useful and powerful.

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Description

🌟 Light up your legend—never miss a moment in the dark!

ENDLESS POWER - Rechargeable lithium-ion battery included for eco-friendly, long-lasting illumination—no more dead batteries.
CUSTOM COMFORT FIT - Adjustable headband ensures a secure, comfortable fit for all-day wear during your most intense expeditions.
BLINDING BRIGHTNESS - Illuminate your adventures with a powerful 1800 lumen LED that outshines the competition.
DIVE READY DURABILITY - Crafted from rugged aluminum alloy and waterproof up to 100 meters, built to brave the wildest conditions.
VERSATILE ADVENTURE COMPANION - Perfectly suited for diving, hiking, camping, fishing, hunting, and emergency roadside use—one headlamp to rule them all.

The Goldengulf GG-F-1020 is a compact, rechargeable headlamp delivering an intense 1800 lumens of LED brightness. Built with durable aluminum alloy and waterproof up to 100 meters, it’s engineered for professional diving and rugged outdoor activities. Featuring an adjustable band and powered by a rechargeable 18650 lithium-ion battery, this headlamp offers reliable, hands-free illumination for all your adventures.

Specifications

Special Feature	adjustable band
Color	Black
Power Source	Battery Powered
Light Source Type	LED
Material	Aluminum
White Brightness	1800 Lumens
Included Components	Battery
Voltage	3.7 Volts
Battery Cell Composition	Lithium Ion
Item Weight	200 Grams
Number of Batteries	1 AA batteries required. (included)
Water Resistance Level	Waterproof
Brand	Goldengulf
Brightness	1800 Lumen
Battery Description	18650 (included)
Style	Compact Headlamp
Finish Type	Polished
Mounting Type	Head Mount
Manufacturer	Goldengulf
Size	Pocket Size
UPC	714559070604
Part Number	GG6699
Item Weight	7.1 ounces
Product Dimensions	3.94 x 1.57 x 3.35 inches
Item model number	GG-F-1020
Batteries	1 AA batteries required. (included)
Is Discontinued By Manufacturer	No
Assembled Height	8.5 centimeters
Assembled Length	10 centimeters
Assembled Width	4 centimeters
Shape	Cylindrical
Finish types	Polished
Number of Lights	1
Special Features	adjustable band
Batteries Included?	Yes
Batteries Required?	No
Bulb Features	high brightness and power efficiency

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