You right that you do loose some power in the AC DC conversion process of course. Every electrical component is going to draw power. However you talk about using a direct DC source. The only direct DC source available without AC DC conversion is a battery! If you dont have AC LEDs and you dont want to use batteries your only other option is an AC DC converter.
The 30% inefficiency is way off.
Mean Wells use 12% of their power consumption to generate DC (ELN-60-48D or P version) and Inventronics are slightly better using only 7% (75W version).
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