switched on? Questions - I have an 18w DC powered light which is run on a AC/DC adaptor. Its input is 230v 0.22 Amp. Now, does this mean the adaptor is using 50.6 watts when powering a 18w lamp? And also does this adaptor still use 50.6 watts even if the lamp is not on and is plugged in - humming and producing heat? In the bigger picture - does the whole unit use 50.6 watts instead of 18w in power consumption?