Can I install 100A 277V incandescent lamps (e.g. Phillips 24661) in a temporary light stringer? If not, why are the lamps made? Alternatively, can I use 277V compact fluorescent lamps? The wire and sockets are 300V rated. It looks like NEC 210.6 (C) would forbid this. I am looking to use 277V for temporary lighting in hallways and 400W metal halide fixtures don't seem the best option for this application.