Unique accessory request (light)

I have been doing a lot of night shoots lately and I've been using either the flash preview button or having an assistant hold a flash light to model's faces to get focus. However I was wondering if there is something I'm missing from my accessory list that would help me get focus.

If there was such a thing that would light up a scene with a hot-shoe light thats only one when you press half way down to get autofocus-> that would be absolutely ideal. Or if there was some kind of range finder hot-shoe thats good in no light (infrared? nightvision? idk). Someone help me with my laziness with flash lights.
 
Try the Yongnuo 622c transceiver. These act as both transmitter and remote receiver for off camera flash and allow you to control the remote flash through your camera's menu. It also has the red pattern light built into the transceiver. You can use one alone in your hot shoe as a focus assist lamp.
 
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