Power problems with ageing kit

I heard somewhere that older equipment, even a couple of years old, can be significantly more power hungry than the current models.  I thought I would put this to the test in our office.

We have a number of large LCD screens in our meeting rooms that are used for software demonstrations, and these are often left switched on or left on standby, sometimes for days at a time.  One of the screens is around 3 years old, whereas the other are more recent, so these became the subjects for my test.

Using a power meeting I tested both screens on standby and full power to measure the wattage drawn.  The results ate below.

 

I was suprised to see the difference in two seemingly identical machines, with the older screen more than 50% less efficient on standby, and around 30% less efficient when switched on.  Obviously we should be taking care to switch these screens off when not in use, but this also suggests we should prioritise the replacement of older kit non-efficient kit.