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What's your thoughts on this?
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While were doing maths I can see the eight florescent tube lights behind the sign art, even trying to overestimate the size of the poster and assuming it has 1.16m wide fluorescent tubes in it that are the brightest available that would be 8 * 36W = 288W.
So I think you're overestimating the power used by the sign by over septuple.
I don't agree with the campaign though, its just more framing consumers (of relatively modest usage) as a big part of the issue when they really are not. If everyone cut their phone use in half it might impact less than a percentage point of CO2. It distracts from the real problems, thereby assisting the big polluters.
I didnt specify it but this was my source: https://adfreecities.org.uk/2019/11/the-electricity-cost-of-digital-adverts/
That might be on the higher end but I guess they dont use the lowest brightness tubes as they need to shine through the poster and also it accounts for the double sided-ness (at least in my area they are always double sided).