The seller must of been mad, a six lamp fitting rarely needs 40 watt lamps, I usually use 25 watt or there near equivalent, though the lampholder style may limit whats available
I'm glad I don't have to pay your electricity bill, 504 watts is ridiculous for a living room. Replace the lamps with 5 watt LEDs. Total 60 watts and you won't need a dimmer.
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