This lasts for up to eight hours with a full charge.
Brad's Deals Editor Jason,
This Foldable LED Book Light, originally $25.99, drops to $12.99 when you enter the promo code KNOXFVL3 during checkout at Yunxiusa via Amazon. Shipping is free, but you must select it at checkout. This is the best price we found by $4. This light is charged via USB and lasts for up to eight hours with a full charge. Note that this price is for the color-changing option, but you can get a similar discount on the other options by using the same code. Sales tax is charged in most states.