Somehow, the energy specifications don't seem to me to be very comprehensible... why does the 45W model only have class B, while the 51W model at https://www.digitec.ch/de/s1/product/dell-u4919dw-49-5120-x-1440-pixels-monitor-10208942?origin=OSA-5241 has A+?

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Good question, I wonder too....
The answer must be there : https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32010R1062&from=EN

with 45W, 40dm2 as monitor (Pbasic=15W) I find EEI Energy Efficiency Index = 0.239 => Class A (almost A+)

maybe I am wrong?

Your data. Your choice.

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Question about Philips 499P9H/00

Somehow, the energy specifications don't seem to me to be very comprehensible... why does the 45W model only have class B, while the 51W model at https://www.digitec.ch/de/s1/product/dell-u4919dw-49-5120-x-1440-pixels-monitor-10208942?origin=OSA-5241 has A+?