ASUS
VS197D-P

This is a 18.5-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 15.4

Annual Energy Use (kWh): 22 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 99 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $8 to $18, depending on electricity rates

AOC
e1649Fwu

This is a 15.5-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 15.0

Annual Energy Use (kWh): 18 kilowatt hours

Lifetime energy savings vs. average Energy Star product: N/A

Lifetime cost savings vs. average Energy Star product: N/A

ASUS
VE198T

This is a 19-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 14.2 watts per square inch

Annual Energy Use (kWh): 27 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 129 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $10 to $23, depending on electricity rates

ASUS
VS208N

This is a 20-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 13.7 watts per sq. inch

Annual Energy Use (kWh): 29 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 145 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $12 to $26, depending on electricity rates

ViewSonic
VA1938w-LED

This is a 18.5-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 13.6 watts per sq. inch

Annual Energy Use (kWh): 25 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 67 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $5 to $12, depending on electricity rates

Dell
IN1930c

This is a 18.5-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 13.4 watts per sq. inch

Annual Energy Use (kWh): 26 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 58 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $5 to $10, depending on electricity rates

Dell
IN2030M

This is a 20-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 13.2 watts per sq. inch

Annual Energy Use (kWh): 30 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 133 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $11 to $24, depending on electricity rates

ASUS
VH197T

This is a 18.5-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 13.0 watts per sq.inch

Annual Energy Use (kWh): 28 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 41 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $3 to $7, depending on electricity rates

ViewSonic
VX1932wm-LED

This is a 19-inch, LED-backlit monitor 

The most energy-efficient models, ranked by square inches of screen illuminated for every watt of electricity used: 12.9 watts per sq. inch

Annual Energy Use (kWh): 31 kilowatt hours

Lifetime energy savings vs. average Energy Star product: 90 kilowatt hours

Lifetime cost savings vs. average Energy Star product: $8 to $16, depending on electricity rates