Candela probably <100 watts. Most of it is heat from tube heaters and power transformer.
The 1548W is the sum of your amps' maximum rated output power, not how much power they consume in normal use. Depending on your speakers, and assuming the amps are typical solid state class AB amps, you would rarely exceed 100W power consumption.
The real advantage (in home audio) of high power amplifiers is that they have lower distortion at a given power output than a smaller amplifier at the same power output because in most amps distortion rises as percentage of power output. 10W output from a 20W rated amp is 50% and will have higher distortion than 10W from 1000W amp with is only 1% max power. So even at normal volume levels the bigger amp sounds more at-ease and more confident on dynamic peaks. No cringing when the loud notes play.
Usually the max current draw on the circuit is the first 1 second after you turn on the amplifier. That's when it draws the most current, to charge up the transformer (a magnetic reservoir) and power supply caps (static charge reservoir.) Some amps have large power supply so they must use a temporary current restriction scheme for the first seconds to limit the P.S. charging current to avoid tripping the breaker, but once it's started, it won't ever draw that much current in operation. You may notice the lights dim for a second if your transformer is ~300VA+. But if it turns on without tripping the breaker you're OK.
