For <50 get a LCD, for >50 get a DLP. LCD is more efficient at small sizes, DLP at larger sizes. And if getting a DLP, get a model that uses an LED light source, which uses even less energy than older DLP models, and which will save you from having to replace the bulb every 1-3 years.
http://michaelbluejay.com/electricity/tv.html
An electric heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt-hour (equivalent to 3.6 megajoules) of energy. A television rated at 100 watts operating for 10 hours continuously uses one kilowatt-hour. A 40-watt light bulb operating continuously for 25 hours uses one kilowatt-hour.
https://en.wikipedia.org/wiki/Watt-hour
TV uses about 80 watts, way less than just about any modern TV. LCD (and LCD/LED). This is the same type of screen that goes in laptop computers and modern computer monitors. Much more efficient than CRT, they use about 125, 210, and 280 watts for the 32, 42, and 52 sizes respectively.
http://michaelbluejay.com/electricity/tv.html
Standby power isn't the problem it used to be. Manufacturers have gotten wise and the overwhelming majority of TV's made after 2006 draw less than 1 watt of power when they're plugged in and not running. That's a mere 11¢/mo. at a sample electric rate of 15¢/kWh.
http://michaelbluejay.com/electricity/tv.html
Most TV's use about 80 to 400 watts, depending on the size and technology. Using a sample cost of 15¢ per kilowatt-hour and five hours of viewing a day, that's $1.83 to $9.13/mo. ($22 to $110 per year). Below you'll find energy usage information for different models.
http://michaelbluejay.com/electricity/tv.html
A kilowatt hour is the amount of energy equivalent to a steady power of 1 kilowatt running for 1 hour, or 3.6 megajoules. Energy cost can be illustrated in a similar example: a 100-watt (i.e. 0.1 kilowatt) light bulb turned on for 8 hours uses 800 Wh or 0.8 kWh.
https://en.wikipedia.org/wiki/Watt-hour
The average light bulb in a home gets around two hours of use per day. For an old-style 60W incandescent this would be 44 kWh/year. A halogen bulb can produce the same 700 lumens two hours per day for 31 kWh/year, but for a CFL that drops to just 9 kWh/year and for an LED just 6 kWh/year.
https://www.ovoenergy.com/guides/energy-guides/how-much-electricity-does-a-home-use.html
The kilowatt-hour is a unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. One watt-second is equal to 1 J. One kilowatt-hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour. The base unit of energy within the International System of Units (SI) is the joule.
https://en.wikipedia.org/wiki/Watt-hour
Household Energy Consumption. The table below gives you an idea of which appliances in your household are contributing the most to your carbon footprint. We have highlighted the low energy light bulb in red to show you that it could save you £12 per year in electricity costs if used instead of a standard 100W bulb. The energy saving could therefore pay for the initial cost of replacing the bulb within the first year, as well as reducing your carbon footprint.
http://www.carbonfootprint.com/energyconsumption.html
The kilowatt hour (symbol kWh) is a derived unit of energy equal to 3.6 megajoules. If the energy is being transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt-hours is the power in kilowatts multiplied by the time in hours.
https://en.wikipedia.org/wiki/Watt-hour
average kwh for tv
The average kilowatt hour for Television is 80 watts.