LED light bulb

01

Check efficacy and power-factor rules for the market

Under 10 CFR 430.32(dd), beginning July 25, 2022 the sale in the United States of any general service lamp that does not meet a minimum efficacy of 45 lumens per watt is prohibited. For lamps manufactured on or after July 25, 2028, integrated LED lamps must have a power factor of at least 0.7, and lamp efficacy must meet formulas by lamp type: for integrated omnidirectional short lamps without standby, efficacy ≥ 123/(1.2 + e^(−0.005 × (lumens − 200))) + 25.9 lm/W, and with standby mode operation the constant is 17.1. [1]

Editorial calculation: at 800 lumens the 2028 formula gives about 124 lm/W for an integrated omnidirectional lamp without standby and about 116 lm/W with standby mode operation, roughly 2.6–2.8 times the current 45 lm/W floor. [1]

Give the supplier the target market and compliance date, lumens and wattage, shape and base, CCT, CRI and R9, beam (omnidirectional or directional), dimming, power factor, standby power for connected lamps, rated life, enclosed-fixture rating and certifications.

02

Read lumens, efficacy, colour and power quality

ENERGY STAR's certified connected light bulb data lists a Philips Hue A19 omnidirectional lamp (model 9290012575) with an E26 medium base at 800 lumens and 10 W (80 lm/W), equivalent to a 60 W lamp, 4000 K, CRI 83 and R9 8, power factor 0.9, 25,000-hour life, dimmable, 0.3 W standby power, and maximum length 107.7 mm and diameter 60.5 mm, certified for the United States and Canada. [2]

Editorial calculation: 800 lm ÷ 10 W = 80 lm/W, matching the listing; this exceeds the 45 lm/W floor but is below the ≈116 lm/W the 2028 formula gives at 800 lm for lamps with standby mode operation, so a lamp of this efficacy manufactured after July 25, 2028 would need higher efficacy for US sale; 0.3 W standby over 8,760 hours is about 2.6 kWh per year. [2] [1]

03

Check the Great Britain ecodesign limits for power, flicker and colour

The Ecodesign for Energy-Related Products and Energy Information (Lighting Products) Regulations 2021 (UK SI 2021/1095, Schedule 3), in force in England, Wales and Scotland from 1 October 2021, caps a light source's on-mode power at Ponmax = C × (L + Φuse/(F × η)) × R. For connected light sources not listed elsewhere η is 120 lm/W and L is 2.0 W; for other light sources η is 120 lm/W and L is 1.5 W. C is 1.08 for a non-directional mains lamp and 1.23 for a directional mains lamp, F is 1.00 for non-directional and 0.85 for directional lamps, and R is (CRI + 80)/160 for CRI above 25. Standby and networked standby power must each not exceed 0.5 W. [3]

Schedule 3 also requires the useful luminous flux and colour temperature to be shown on the lamp surface where space allows, with beam angle added for directional lamps. [3] These limits differ from the US 45 lm/W sales floor and the 2028 power-factor rule described above, so a lamp listed in the US dataset is not by that listing shown to meet GB rules. [1] [2]

Editorial calculation: for an 800 lm, CRI 83 non-directional mains connected lamp, R = (83 + 80)/160 = 1.02 and Ponmax = 1.08 × (2.0 + 800/120) × 1.02 ≈ 9.5 W; the 10 W ENERGY STAR-listed A19 above would exceed that by about 0.5 W. As a non-connected lamp (L = 1.5 W) the cap would be about 9.0 W.

The European Commission's EPREL energy-label database shows what a registered E27 bulb declares. LEDVANCE model AC49436, registered under the EU 2019/2015 labelling act and on the market from 6 April 2023, is a non-directional mains lamp giving 806 lm at 8.5 W on-mode power, 9 kWh per 1,000 h and energy class F on the A–G scale, at 4000 K and CRI 80, with a lumen maintenance factor of 0.93, a survival factor of 0.9, displacement factor 0.7, flicker Pst LM 1, stroboscopic effect SVM 0.4, colour consistency of 6 (MacAdam steps), 0 W standby, no dimming, and dimensions of 106 × 60 × 60 mm, with a 60 W equivalence claim. [4]

Editorial calculation: 806 ÷ 8.5 ≈ 95 lm/W. Against the GB Schedule 3 formula for a non-connected, non-directional mains lamp with CRI 80, R = (80 + 80)/160 = 1.0 and Ponmax = 1.08 × (1.5 + 806/120) × 1.0 ≈ 8.9 W, so the declared 8.5 W sits about 0.4 W under the cap; its Pst LM of 1 and SVM of 0.4 sit exactly at the GB limits, and its displacement factor of 0.7 is above the 0.5 required for 5–10 W lamps. EPREL data are the supplier's declaration for the EU market, not a GB compliance finding. [4] [3]

For Great Britain, ask the supplier for declared Pon, useful flux, CRI, displacement factor, Pst LM, SVM and standby power, and check Pon against the Schedule 3 formula.

04

Compare what suppliers offer

The supplier linked to this page lists LED light bulbs; its card links to the page reviewed.

Ask any supplier for a photometric test report with lumens, watts and efficacy, CCT and CRI with R9, power factor and harmonic data, rated life basis, dimming compatibility, standby power for smart lamps, dimensions and base, enclosed-fixture rating, and certifications for the target market.

05

Trace what each part does

This is a functional reference built from the sources cited; it is not one maker's specification.

06

Fill the specification fields with values for your order

An LED bulb quotation needs values for your market. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.

07

Send the market, output and colour data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Market: [country; compliance date]
Output: [lumens; watts; efficacy]
Shape and base: [shape; base type]
Colour: [CCT; CRI; R9]
Power: [voltage; PF; dimming; standby]
Life and ratings: [hours; enclosed fixture]
Certificates: [ENERGY STAR; UL; CE]

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