I just stumbled across this article/video, sure looks to me like a Notek light on this tank.

Am I right? Not a huge T34 buff, so no idea if the Russians borrowed the idea from the Germans or not, but from a model I just looked at, there was no light in that location. Looks just like the StuGIIIG (and others no doubt) mount to me.

[link]http://seattletimes.nwsource.com/flatpages/video/mediacenterbc3.html?bcpid=30884189001&bctid=892155 89001[/link]

at :44 is a good shot of it.