Why are people still buying book lights with conventional incandescent bulbs? The answer isn’t price: The famous Itty Bitty light costs $45 (some of which probably goes to that cutesy package), and users have to budget $7 a pop for replacement bulbs. Meanwhile, LED bulbs practically last forever and are more eco-friendly to boot, using much less energy to deliver comparable light. This Xtra Flex 2 from Mighty Bright has a more easily maneuverable neck than the Itty Bitty lamp, clips firmly onto your book (or stands by itself), and at $17 is just over a third of its competitor’s price. Granted, those of us who don’t want to run on battery power have to spend another $10 on an AC adapter — it’s still a bargain, and the cord is long enough to reach the most inconvenient under-the-bed power outlet. The Mighty Bright folks have branched out cleverly, with a two-arm light/magnifier gizmo for crafters and some sleek workhorses for musicians, but the item that will likely come in handy for us all at some point, whether we read at bedtime or not, is a magnifying glass with a built-in lamp — you may still have a hard time comprehending the fine print of that new cell-phone contract, but at least you’ll be able to read it.