Paragraph 1 Energy efficiency requirementsI1
England, Wales and Scotland
Light sources
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—
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;
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;
efficacy factor (F) is—
1.00 for non-directional light sources (NDLS, using total flux);
0.85 for directional light sources (DLS, using flux in a cone);
CRI factor (R) is—
0.65 for CRI ≤ 25;
(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 |
For the purposes of this paragraph—
where applicable, additions on correction factor C are cumulative;
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);
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;
the standby power Psb of a light source must not exceed 0.5 W;
the networked standby power Pnet of a connected light source must not exceed 0.5 W;
the allowable values for Psb and Pnet must not be added together.
This paragraph is subject to the exemptions in paragraph 3(3) of Schedule 4.
Annotations
Commencement
- I1
Sch. 3 para. 1 in force at 1.10.2021, see reg. 1(2)