There is literally a same topic thread a few topics down.
Copy/paste:
Cordless has its merits. So does wired.
When I was in dental school, I swore I would get a cordless light when I graduate. In school, you often take off your loupes so yes, cordless light would be more convenient.
Now that I've graduated and see pt constantly throughout the day, wired is certainly better. MUCH brighter lights, I don't have to turn off the light for 8 hours and still have charge, and the wire doesn't really bother me once I set it up well in the morning. I can't imagine having to stop working and switch batteries 2 or 3 times a day. Some of them even 4 times! (Given 8 hour work day)
Wireless IS indeed heavier. Imagine that on top of heavier loupes, like eyezoom.
I use the orascoptic lights.
I did try the spark. It does add weight to the loupes and certainly convenient as wireless. Ask yourself if the light intensity and battery life are worth sacrificing for going wireless. You will need multiple battery packs to use while others are charging.