Intense-pulsed-light (IPL) devices target the root of the hair, causing it to fall out and greatly reduce regrowth over time. It's not something you'll see results from immediately or uniformly. After a few weeks of zapping my legs with the HoMedics Duo Lite, I was surprised to see leg hair growing back in patches. That might not sound good, but when you're already planning to remove leg hair, the less of it that's growing the better. That was from one of the lowest settings; after cranking it up for a few more weeks, the results were better. The company says it feels like snapping a rubber band to your skin, but I didn't feel anything at all.
HoMedics says this IPL device is not safe for use on blonde, red, or gray hair, nor on very dark skin. Even if you have pale skin and dark hair, do a patch test and start on the lowest setting. It will take some time to see results, but you don't want to permanently mark your skin by rushing or using something that's not appropriate for you.