You have expressed concern about whether or not even these LEDs are going to be "bright enough" for your task.... and to be honest... Even I am having my doubts for your application... and my reasoning is not really because it might not be enough lumens, but more than LED light is much more apt to get "washed out" in situations where it is in competition with ambient light sources. If you are poking around in rooms with sunlight poking through some windows (so your eyes are adjusted for the bright sunlight) but maybe trying to illuminate the interior of a wall or some hidden electrical work, an LED *might* not be sufficient, even though they are 150+ lumens these days, the light spectrum really gets absorbed by earthy colors, which may apply to partially incomplete structures with the natural browns of insulation backing and exposed wood, or especially poking around in crawl spaces and basements with dirt floors etc... LED works really well in "completed" interior situations, (white walls!!), but something tells me a lot of your work would involve incomplete buildings....
I'm leaning towards recommending another incan, but in the end, I, like any good CPFer, will recommend that you own BOTH! Or... you might consider an electrolumens multi-emitter LED light, (I think they are taking orders on a "quad-star" Soul P4 job that runs 3 C size cells, you could use NIMH cells and get around 2 hours runtime. I'm not sure what's going on with them lately they used to have a lot more various lights available on their site and now I only see a few... They used to have some "D" size lights that would really be great performers in the runtime and brightness department.