The manufacturer advertises 113 lumens. I have no reason to doubt this. This is an excellent little light as a back-up and I have even ued it as a primary light on night dives in clear tropical water.
McKaden P okay so steve i lost my glasses at the bottom of a very murkey lake. would it be able to bounse off the mud and gunk at the bottom of the lake or would it just be absorbed.
STEVE G The difinitive answer is "that depends". By "a very murkey lake" do you mean that there is some degree of visibility? OR, are you talking "blackwater"? If there is any degree of visibility, even 1-2 feet, I would think that this light would be adequate for the purpose -- providing of course, that you do not stir up the bottom in essence creating a blackwater situation. If the lake has zero visibility, it does not matter what type, size or brightness of light you use as they all in essence perform the same -- all you will see is the reflecton of the light beam from suspended particulate matter. In a blackwater situation, forget the light and find the object, in this case glasses, by feel. I would recommend either a tropical weight glove with "leather-like" palm and finger substance, or no gloves at all if the water temperature will allow it.