The power consumption of computer or tv displays vary significantly based on the display technology used, manufacturer and build quality, the size of the screen, what the display is showing (static versus moving images), brightness of the screen and if power saving settings are activated.
LED & LCD screens use the same TFT LCD (thin film transistor liquid crystal display) technology for displaying images on the screen, when a product mentions LED it is referring to the backlighting. Older LCD monitors used CCFL (cold cathode fluorescent) backlighting which is generally 20-30% less power efficient compared to LED-backlit LCD displays.
See the energy consumption of a 22 inch LED-backlit LCD display using 30 Watts for 5 hours a day @ £0.19 per kWh. Check the table below for further information.
Cost Per Hour: £0.0057
Cost Per Day: £0.0285
Cost Per Month: £0.87
Cost Per Year: £10.40
kWh Per Day: 0.15
Tip:In general we recommend LED displays because they offer the best power savings and are becoming cheaper. Choose a display size you are comfortable with and make sure to properly calibrate your display to reduce power use. Enable energy saving features, lower brightness and make sure the monitor goes into sleep mode after 5 or 10 minutes of inactivity. Some research studies also suggest that setting your system themes to a darker color may help reduce energy cost, as less energy is used to light the screen. Also keep in mind that most display will draw 0.1 to 3 watts of power even if they are turned off or in sleep mode, unplugging the screen if you are away for extended periods of time may also help. Never leave your TV on standby.
Screen Size LED LCD CRT Plasma
15 inches 15 18 65 ---
17 inches 18 20 75 ---
19 inches 20 22 80 ---
20 inches 24 26 90 ---
21 inches 26 30 100 ---
22 inches 30 40 110 ---
24 inches 40 50 120 ---
30 inches 50 60 --- 150
32 inches 55 70 --- 160
37 inches 60 80 --- 180
42 inches 80 120 --- 220
50 inches 100 150 --- 300