# The Ecodesign for Energy-Related Products and Energy Information (Lighting Products) Regulations 2021, Paragraph 5


(1) The following information must be displayed on light sources when they are placed on the market.
(2) For all light sources except CTLS, LFL, CFLni, other FL, and HID—
(a) the value and physical unit of the useful luminous flux (lm); and
(b) correlated colour temperature (K);
must be displayed in a legible font on the surface provided that, after the inclusion of safety-related information, there is sufficient space available for it without unduly obstructing the light emission.
(3) For directional light sources, the beam angle (°) must also be displayed in a legible font on the surface, provided that the condition set out in sub-paragraph 2 regarding the availability of sufficient space is met.
(4) If there is room for only two values, the useful luminous flux and the correlated colour temperature must be displayed.
(5) If there is room for only one value, the useful luminous flux must be displayed.

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Source: https://www.legislation.gov.uk/ukdsi/2021/9780348225488/schedule/3/paragraph/5 (the official version)
Page: https://openlegislation.uk/draft-ecodesign-for-energy-related-products-and-energy-information-lighting-products-regulations-2021/schedule-3/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.