Yep. I just checked. Here's a pic. It's not a great pic, but you get the idea. All the drives on both my C6100's have solid green status lights, and blinking green activity lights. I'm *assuming* that they have the capability to go orange if there is an issue. I know for sure that the caddy indicators are just plastic light-pipes and not LEDs.
I will also tell you that the HP caddies are of a lower quality than the stock ones. Having thrown that in, I'll also say that they fit, they lock, and I haven't had a problem with any of them. They just feel cheap.