The Astro Pneumatic 40SL is one of the best Slim Lights on the market. Its long lasting, going 10 hours with 50% power and 2.5hours on full power. In addition, its USB rechargeable, ensuring you'll never be without a solid light at your side. Its 40 chip COB LED array gives light density 850% greater than SMD LED's, all while using less power. This light is clearly on a whole new level.