I've have a 30 LED lantern that I got to use at my cabin where the only power is DC. The light isn't as bright as I wanted. I read this article
http://www.otherpower.com/otherpower_lighting.html that discusses different kinds of light sources and shows lumens/watt ratings, the real measure of light output. I tried 7 watt screw-in compact fluorescent bulbs and I couldn't believe how much light they put out for the amount of energy used. Low watt tube type fluorescents are good too. I have some LED fixtures too and they don't even come close.
LED is great for flashlights tho. My favorite only has one LED and it's very bright and throws a good beam for a long ways. I've used it for over a year and leave it on a LOT and it's still just as bright as when I got it. There's differences in types of LED's and if you get the right kind they do put out a lot of light. It's just a softer light.
My favorite lantern is a Craftsman 19.2 volt fluorescent worklight that uses the same rechargeable batteries my cordless tools. It lasts a long time and puts out a lot of light.
Here's a picture where the only light is a 7 watt fluorescent over the table and one over the sink. LED's don't give out that much light. and it's more direct. The flashlight I was talking about is on the table. It only cost $7 at Menards.