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The energy efficiency class of light sources must be determined as set out in Table 12, on the basis of the total mains efficacy ηTM, which is calculated by—

(a)

dividing the declared useful luminous flux Φuse (expressed in lm) by the declared on-mode power consumption Pon (expressed in W); and

(b)

multiplying by the applicable factor FTM in Table 13,

as follows—

  • ηTM = (Φuse/Pon) × FTM (lm/W).

    Table 12

    Energy efficiency classes of light sources

    Energy efficiency classTotal mains efficacy ηΤM (lm/W)
    A210 ≤ ηΤM
    B185 ≤ ηΤM < 210
    C160 ≤ ηΤM < 185
    D135 ≤ ηΤM < 160
    E110 ≤ ηΤM < 135
    F85 ≤ ηΤM < 110
    GηΤM < 85

    Table 13

    Factors FTM by light source type

    Light source typeFactor FTM
    Non-directional (NDLS) operating on mains (MLS)1.000
    Non-directional (NDLS) not operating on mains (NMLS)0.926
    Directional (DLS) operating on mains (MLS)1.176
    Directional (DLS) not operating on mains (NMLS)1.089