That is COOOOOL! I, too, have had the traditional curing light used on me several times--I have terrible teeth
but this isn't the place to get into that.
Anyway, I can think of a place or 2 where it might be handy. My orthodontist uses them, but rarely to never are using more than 1 at a time. Replace all their guns, er I mean light, with 1 cordless LED unit.
As for myself? It looks a lot more comfortable that the "traditional" curing tool.
Don't UV LEDs degrade quickly though? Or am I just dreaming?
I think (think) the thing that keeps the current tools so bulky is the fan for the halogen bulb
Edit:
"Blue LEDs generate a light that closely matches the absorption spectrum of the photo-initiator systems most frequently used in dental materials."
Ahhhh...doesn't use UV leds.