{
  "url": "https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-lighting-products-regulations-2021/schedule-12/paragraph-1",
  "json_url": "https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-lighting-products-regulations-2021/schedule-12/paragraph-1.json",
  "legislation": "ukdsi/2021/9780348225488",
  "legislation_title": "The Ecodesign for Energy-Related Products and Energy Information (Lighting Products) Regulations 2021",
  "legislation_url": "https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-lighting-products-regulations-2021",
  "path": "schedule/12/paragraph/1",
  "kind": "paragraph",
  "number": "1",
  "heading": null,
  "text": "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—\n(a) dividing the declared useful luminous flux Φuse (expressed in lm) by the declared on-mode power consumption Pon (expressed in W); and\n(b) multiplying by the applicable factor FTM in Table 13,\nas follows—\nηTM = (Φuse/Pon) × FTM (lm/W).\nTable 12\nEnergy efficiency classes of light sources\nEnergy efficiency class\nTotal mains efficacy ηΤM (lm/W)\nA\n210 ≤ ηΤM\nB\n185 ≤ ηΤM < 210\nC\n160 ≤ ηΤM < 185\nD\n135 ≤ ηΤM < 160\nE\n110 ≤ ηΤM < 135\nF\n85 ≤ ηΤM < 110\nG\nηΤM < 85\nTable 13\nFactors FTM by light source type\nLight source type\nFactor FTM\nNon-directional (NDLS) operating on mains (MLS)\n1.000\nNon-directional (NDLS) not operating on mains (NMLS)\n0.926\nDirectional (DLS) operating on mains (MLS)\n1.176\nDirectional (DLS) not operating on mains (NMLS)\n1.089",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ukdsi/2021/9780348225488/schedule/12/paragraph/1",
    "retrieved_at": "2026-10-30T14:46:52.629854+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}