What is the brightness of the light? I would appreciate knowing the lumens, not just a statement that it is bright.

The LEDs used in the strobe are 156 lm with a Luminous efficacy of. 151 lm/W. We will add that to the description.

What depth can it withstand while diving?

It's been taken down to 90 feet without issues.

Is this bright enough for daytime use?

there is no strobe which is bright enough for daylight use. in direct sunlight, you need to use colored smoke or a signal mirror (directed signal) type device. the sun emits white light and there are few devices which will emit something of similar intensity....

Color	Water-Activated
Shape	Rectangular
Material	Acrylonitrile Butadiene Styrene (ABS), Plastic
Finish Type	Steel
Light Source Type	Light Emitting Diode
Shade Material	Acrylonitrile Butadiene Styrene
Power Source	Battery Powered
Brand	Lifesaving Systems Corp
Style	Modern
Voltage	12 Volts
Are Batteries Included	No
Manufacturer	Lifesaving Systems Corp
UPC	608802526201
Part Number	641-LRS
Item Weight	1.58 ounces
Package Dimensions	6.5 x 3.2 x 0.6 inches
Item model number	641-LRS
Is Discontinued By Manufacturer	No
Finish types	Steel
Batteries Included?	No
Batteries Required?	No

Aqua-Sirius LRS, Water Activated Long Range LED Strobe Light - USCG Approved Signaling Strobe - Does NOT Replace Flares and FAA TSO-C85b Approved, Exceeds Solas Requirements - Made in USA

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