I have been researching a lot on power consumption of crt vs lcd these last years (TV technician) . I have reached this conclusion: energy saving companies (ex. Energy Star, energysavers.gov) grossly overrate the power consumption of crt monitors. (and lcd monitors)
For example:
HP p930 CRT monitor 19"
rated +- 120watts
TRUE watts (tested with amp meter. watts=Volts x Amps)
122.8V(line ac) x 0.4A(average) (0.3A Min - 0.5Amax (dark scenes, white raster) = approximately 50 watts average
Cost per year at 5 hours a day 70 days a year (8.5c per kwH example)
=1.48$
These companies rate these monitors at 150 watts average. Thats triple the average true watts. That would add up 4.46$ a year.
To compare:
LCD Monitor Generic 19 inch
true wattage 0.2A x 122.8VAC = average 28 watts
that amounts to 0.833$ per year.
So you save 0.647$ per year (if you pay 8.5c per KwH)
Are the companies trying to make us change monitors or something? Is there really a need to change to LCD just for a drop of less than a dollar per year. OR are the people who test these monitors just incompetent. Just to compare an average samsung 32inch LCDTV takes a wallop of 200W constantly on your electricity (at max backlight, where people usually watch the TV)
A 32 inch CRT TV (sanyo) takes an average of about 120watts ( from 70watts to 140 watts max (bright scenes, etc))
For example:
HP p930 CRT monitor 19"
rated +- 120watts
TRUE watts (tested with amp meter. watts=Volts x Amps)
122.8V(line ac) x 0.4A(average) (0.3A Min - 0.5Amax (dark scenes, white raster) = approximately 50 watts average
Cost per year at 5 hours a day 70 days a year (8.5c per kwH example)
=1.48$
These companies rate these monitors at 150 watts average. Thats triple the average true watts. That would add up 4.46$ a year.
To compare:
LCD Monitor Generic 19 inch
true wattage 0.2A x 122.8VAC = average 28 watts
that amounts to 0.833$ per year.
So you save 0.647$ per year (if you pay 8.5c per KwH)
Are the companies trying to make us change monitors or something? Is there really a need to change to LCD just for a drop of less than a dollar per year. OR are the people who test these monitors just incompetent. Just to compare an average samsung 32inch LCDTV takes a wallop of 200W constantly on your electricity (at max backlight, where people usually watch the TV)
A 32 inch CRT TV (sanyo) takes an average of about 120watts ( from 70watts to 140 watts max (bright scenes, etc))
















LCD (not LED LCD) has so much more mercury considering some have up to 12 mercury lamps.... and most CRT's were leadless from 2000 on. Ever changed mercury lamps on a LCD? I've changed lamps in a lot of LCD monitors and believe me, they will not last as long as rated. Most LCD's will have inverter and lamp problems within the first 10 years. You can't even throw away a LCD monitor without 'disposing of it accordingly to law'.


Besides people would have to reinforce their desks if they decided to go with 24" ws crt's instead of lcd's.