The MV in MV photon means megavolt
When we see 6 mv in a statement, it usually means 6 millivolts. That's 0.006 volts, or 6/1000ths of a volt. Don't confuse it with 6MV, which is 6 Megavolts, or 6 million volts!
elect m\v transformer
medium voltage panel
marine vessel