Other than the obvious, what's the difference between ETC Part# RT113 and RT115, (and RT114&RT171; RT196&HPL750/120X)? Seems incredulous that the exact same performance can be expected from lamps of different voltages.
Hi Derek - the difference is - the filaments are sized slightly differently so that one achieves rated performance at 115V, the other at 120V. Historically, the 115V version came first - designed specifically for theater applications where most lamps are at the end of multiple feet of cable with multiple in-line connectors so the lamp in the fixture never sees the 120V coming out of the wall. This is great unless you are in a situation where the power is actually greater than 115V at the fixture and lamp life suffers greatly - so the 120V versions were created.
Hi Derek - the difference is - the filaments are sized slightly differently so that one achieves rated performance at 115V, the other at 120V. Historically, the 115V version came first - designed specifically for theater applications where most lamps are at the end of multiple feet of cable with multiple in-line connectors so the lamp in the fixture never sees the 120V coming out of the wall. This is great unless you are in a situation where the power is actually greater than 115V at the fixture and lamp life suffers greatly - so the 120V versions were created.
