What is the beam angle? what is the lumen output? where can i find an lm-79 test report?

the beam angle is 30°，lumen output: 350lm, hope you like it.

Will this work for my 48volt lithium ebike battery

Technically you could but it would require a 12 volt conversion system to kick the voltage down to normal operating ranges.

Can this lights be used as a reverse light on a Boat trailer that will be submersed in Saltwater while launching and loading boat on trailer?

As I didn't utilize them for my project, I can't provide you with a factual response. However the SELLER of this product is excellent about communication, and I'm confident that they would provide the must accurate response. Good luck.

Brand	Partsam
Colour	Black,Red
Specific Uses For Product	Boat Lights
Vehicle Service Type	ATV, Boat, Truck
Model Year	2023
Special Feature	Extreme Weather Resistance, Excellent Heat Dissipation, and Universal Application
Wattage	18 Watts
Auto Part Position	Front
Lens Colour	Clear
Lens Material	Polycarbonate
Net Quantity	2 Count
Assembly Required	No
Manufacturer	Partsam
Model	Universal LED Light Bar
Package Dimensions	20 x 10.3 x 6.7 cm; 453.59 g
Item model number	‎GTCV-0964099239
Exterior	polished
Manufacturer Part Number	‎GTCV-0964099239
Inner Material	aluminium
Outer Material	aluminium
Material	metal
Size	2Pcs
Water Resistance	Waterproof
Special Features	Extreme Weather Resistance, Excellent Heat Dissipation, and Universal Application
Country of Origin	USA
Item Weight	454 g

Partsam 6" LED Light Bar 36W 6500K Super Bright Spot Work Light Pods Single Row Off Road Driving Light Fog Light Boat Light Waterproof SUV ATV 4WD Car Truck Golf Cart 12V 24V IP67 2pcs

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