Fact of the matter is the basic bend and shake chem lights suck and are massively overpriced. I wouldn't buy one costing more than $1 yet most sell for $1.50 to $2. (BTW Walmart sells 2 for $2 in the camping section & is the cheapest i ever find)

So even the cheapest battery powered chem light is better unless its for a completely disposable reason like keeping a bunch of kids occupied. I use Krill chem lights, they are battery powered and the green and white are super bright. I use the red as a night light in hotels, the Green 180 degree extreme for everything else. The standard 360 degree green is about the same electroluminesence as a Timex watch backlight though with a much much larger panel. The 180 is brighter than that.