This kind of light is good for chilling, but doesn't quite reach the level of "bright" that is sometimes nice (e.g. while cooking dinner). If you are in an enclosed space where light will get thrown on the ceiling and walls, it will be brighter. But I suggest getting a high-brightness camping lantern or two which you can switch on and off for when you need "bright".
P.S. In my opinion, the cold-white colour is kind of a drag, and the multicoloured ones are prettier, though they will probably feel less bright.
Pay attention to customer reviews. People say 8 to 10 hours of battery life which is a drag and you can certainly find others that will last longer... but it also means these ones might be bright enough without a lantern. Then again, do you want to be replacing batteries every night? There's a tradeoff between brightness and battery life, another good reason to have low-brightness (long-lasting) lights that are on all week, and high-brightness lanterns that are only on in bursts when you need them.