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4 monitors side by side.

6 h a day
  • Electricity at €0.2832 per kWh (household price with taxes, Eurostat 2026-S1).
  • 210 g CO₂e per kWh generated in 2023 (European Environment Agency). Counts use only, not manufacturing.

Electricity prices in all EU countries

  • Lenovo

    T34WD-40(A253403T0)
    E 34″QHDLCD / LED

    €15.51 per year

    +€10.54 a year

  • AOC

    CU34E4CW
    D 34″QHDLCD / LED

    €12.40 per year

    +€7.44 a year

  • Cheapest to run

    Hgfrtee

    B340QQU16
    C 34″QHDLCD / LED165 Hz

    €4.96 per year

  • EIZO

    FlexScan EV3451X
    C 34″QHDLCD / LED

    €9.86 per year

    +€4.90 a year

Yearly running cost

Bars in proportion to the energy each model uses.

  • Lenovo T34WD-40(A253403T0) €15.51
  • AOC CU34E4CW €12.40
  • Hgfrtee B340QQU16 €4.96
  • EIZO FlexScan EV3451X €9.86
Model Lenovo T34WD-40(A253403T0) AOC CU34E4CW Hgfrtee B340QQU16 EIZO FlexScan EV3451X
Running cost
Running cost (per year) €15.51 €12.40 €4.96 €9.86
over 10 years €155 +€105 over 10 years €124 +€74 over 10 years €50 €99 +€49 over 10 years
kWh per year 54.8 43.8 17.5 34.8
kg CO₂e per year from electricity use 11 9.2 3.7 7.3
Specifications
Brand Lenovo AOC Hgfrtee EIZO
Model T34WD-40(A253403T0) CU34E4CW B340QQU16 FlexScan EV3451X
Energy class E D C C
Screen size 34″ (86.4 cm) 34″ (86.4 cm) 34″ (85 cm) 34″ (86.7 cm)
Power in on mode (SDR) 25 W 20 W 8 W 15.9 W
Energy class (HDR) G G – –
Power in on mode (HDR) 36 W 46 W – –
Standby 0.5 W 0.5 W 0.1 W 0.3 W
Networked standby 0.7 W 2 W – –
Off mode 0.3 W 0.3 W 0 W 0.2 W
Resolution 3440 × 1440 3440 × 1440 3440 × 1440 3440 × 1440
Aspect ratio 21:9 21:9 16:9 21:9
Panel LED LCD LED LCD LCD LCD
Refresh rate 60 Hz 60 Hz 165 Hz 60 Hz
Power supply Internal Internal External Internal
Guaranteed support 7 years 8 years 1 year 7 years
Software updates 8 years 8 years 1 year 7 years
Spare parts available 7 years 7 years 1 year 7 years
On the market since February 26, 2025 October 15, 2025 March 18, 2026 August 11, 2026
EPREL registration number 2262201 2418682 2665077 2663315

Rows where the models differ are highlighted.