I don't know the actual luminosity, but I use these lanterns for power outages. I have three of them. I keep one by the power panel, one by the emergency generator, and one by the head of the stairs heading down from the bedrooms. In case of a power outage they come on automatically.
I recommend this lantern.
Nancy O I didn't make my question clear at all! What I want is a lantern with enough output to read by.
ROBERT S Well, it doesn't light up the room like a table lamp would, but it's easier to read by than my 40W desk lamp.