The unit provides 880 lumens of light, which is roughly the same as a bulb that you might use as your main source of light in a bedroom. (i.e. it's not as bright as the lighting you might like to have in your living room or kitchen but it's brighter than the light from a desk lamp or bedside lamp). That would seem to be bright enough in my view.
At just 10W, it will cost next to nothing to run. (You'll get about about 5 hours of light for just 1p). All you need to worry about is as to how easily (or not) it can be connected to the mains power in your home - but that's going to be the same whichever lamp you decide to buy (unless, of course, you change your mind and opt for a solar one).