I guess its better with only emitters. BUT (and its a big but) only if you add some other low power emitters (perhaps 2) around the model, i mean like long rectangular boxes so that you dont get 2 funky shadows. that way, the scene will still be bright, but you will still see the headlamp thing.
-OR-
you could go for a nice smokey.foggy effect and put the whole thing in a giant SSS cube and see the headlamp from the model illuminate a cone of light, that'd be pretty kewl
mind uploading the blend file? id like to take a closer look at that thing, looks interesting
