The DTL PC on this light has a yellow label that says FOR 120 VAC OPERATION ONLY on it. The first 120V DTL PCs used here had that label on them to "warn" the linemen, even though all the PC sockets on the lights NECo used were wired for 120V...
I prefer the deep glass but I like the shallow too. The shallow glass is pretty rare here. I've barely seen it (probably more common before they got rid of the 400W mercs). Most GE M-400 style lights have the deep glass.