# The Ecodesign for Energy-Related Products and Energy Information (Lighting Products) Regulations 2021, Paragraph 1: Energy efficiency requirements

Extent: E+W+S

Light sources
(1) The declared power consumption of a light source Pon must not exceed the maximum allowed power Ponmax (in W), defined as a function of the declared useful luminous flux Φuse (in lm) and the declared colour rendering index CRI (-) as follows—
Ponmax = C × (L + Φuse/(F × η)) × R;
where—
(a) the values for threshold efficacy (η in lm/W) and end loss factor (L in W) are as specified in Table 2, according to the light source type;
(b) basic values for correction factor (C) depending on light source type, and additions to C for special light source features are specified in Table 3;
(c) efficacy factor (F) is—
(i) 1.00 for non-directional light sources (NDLS, using total flux);
(ii) 0.85 for directional light sources (DLS, using flux in a cone);
(d) CRI factor (R) is—
(i) 0.65 for CRI ≤ 25;
(ii) (CRI+80)/160 for CRI > 25,
rounded to two decimals.
Table 2
Threshold efficacy (η) and end loss factor (L)
Light source description
η
L
(lm/W)
(W)
LFL T5-HE
98.8
1.9
LFL T5-HO, 4,000 ≤ Φ ≤ 5,000 lm
83.0
1.9
LFL T5-HO, other lm output
79.0
1.9
FL T5 circular
79.0
1.9
FL T8 (including FL T8 U-shaped)
89.7
4.5
From 1st September 2023, for FL T8 of 2-, 4- and 5-foot
120.0
1.5
Magnetic induction light source, any length or flux
70.2
2.3
CFLni
70.2
2.3
FL T9 circular
71.5
6.2
HPS single-ended
88.0
50.0
HPS double-ended
78.0
47.7
MH ≤ 405 W single-ended
84.5
7.7
MH > 405 W single-ended
79.3
12.3
MH ceramic double-ended
84.5
7.7
MH quartz double-ended
79.3
12.3
OLED
65.0
1.5
Before 1 September 2023: HL G9, G4 and GY6.35
19.5
7.7
HL R7s ≤ 2 700 lm
26.0
13.0
Connected light sources (CLS) not mentioned above
120.0
2.0
Other light sources not mentioned above
120.0
1.5
Table 3
Correction factor C depending on light source characteristics
Light source type
Basic C value
Non-directional (NDLS) not operating on mains (NMLS)
1.00
Non-directional (NDLS) operating on mains (MLS)
1.08
Directional (DLS) not operating on mains (NMLS)
1.15
Directional (DLS) operating on mains (MLS)
1.23
Special light source feature
Addition on C
FL or HID with CCT > 5,000K
+0.10
FL with CRI > 90
+0.10
HID with second envelope
+0.10
MH NDLS > 405 W with non-clear envelope
+0.10
DLS with anti-glare shield
+0.20
Colour-tuneable light source (CTLS)
+0.10
High luminance light source (HLLS)
+ 0.0058 · Luminance-HLLS – 0.0167
(2) For the purposes of this paragraph—
(a) where applicable, additions on correction factor C are cumulative;
(b) the addition for HLLS must not be combined with the basic C-value for DLS (basic C-value for NDLS must be used for HLLS);
(c) light sources which allow the end-user to adapt the spectrum and/or the beam angle of the emitted light, resulting in changes to the values for useful luminous flux, colour rendering index (CRI) and/or correlated colour temperature (CCT), and/or changing the directional/non-directional status of the light source, must be evaluated using the reference control settings;
(d) the standby power Psb of a light source must not exceed 0.5 W;
(e) the networked standby power Pnet of a connected light source must not exceed 0.5 W;
(f) the allowable values for Psb and Pnet must not be added together.
(3) This paragraph is subject to the exemptions in paragraph 3(3) of Schedule 4.

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Source: https://www.legislation.gov.uk/uksi/2021/1095/schedule/3/paragraph/1 (the official version)
Page: https://openlegislation.uk/ecodesign-for-energy-related-products-and-energy-information-lighting-products-regulations-2021/schedule-3/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.