Read the Efficacy (lm/W) Rating on LED Lighting Properly
This page contains Coupang Partners affiliate links; the operator may earn a commission.
Key Takeaway
lm/W on LED lighting is the light output per 1W of power. The agency's LED list shows efficacy and rated power, but first match the luminous flux (lm) you need, the socket, and the color temperature (K).
How do lm, W, and K differ?
lm is luminous flux, W is power consumption, and K is color temperature. Efficacy in lm/W is luminous flux divided by power consumption, so you can't compare bulb brightness from W alone. A higher color temperature doesn't mean it uses less electricity or has more luminous flux either. First sort out which item each unit refers to.
The Korea Energy Agency's LED lamp product search shows efficacy (lm/W) and rated power (W). Comparison only means something if you decide the use and the luminous flux you need first and then look at efficacy. If a low-W bulb is too dim and you end up turning on several, the numbers for a single bulb can't describe the whole usage condition. The socket of the fixture you will replace and the space the bulb has to fit in are also items to check separately.
How do the official specs of the two color temperature candidates differ?
| Manufacturer product code (12NC) | Product name | Power consumption | Nominal luminous flux | Manufacturer rated efficacy | Color temperature | Socket | Dimmable |
|---|---|---|---|---|---|---|---|
| 929003776022 | LEDBulb 8W E26 3000K A60 1PF/6 KR | 8W | 750lm | 93lm/W | 3,000K | E26 | No |
| 929003776122 | LEDBulb 8W E26 6500K HPF A60 1PF/6 KR | 8W | 750lm | 93lm/W | 6,500K | E26 | No |
I looked at the official Philips pages and the agency list on October 8, 2026. Check the price on the purchase link side. The two candidates have the same nominal luminous flux and W, and only the color temperature differs. The EANs on the manufacturer pages are 8719514387201 and 8719514387249 respectively. Don't assume the same product code just because both are sold as 8W; match the code and color temperature of the product on sale.
The GTIN of the warm white sales option I linked is 8719514387201, the same as the EAN of the first official candidate. However, the seller's detail description also mixes in other labels, such as daylight white and 5.7×5.7×9.8. Before buying, recheck the EAN, color temperature, and dimensions on the selected option and the actual packaging. I did not use the mixed labels in the sales description as a basis for the official specs above.
Why does 750 divided by 8 come out slightly different from 93?
Calculating from the nominal values in the table gives 750÷8=93.75lm/W. The manufacturer's official specs list the rated efficacy as 93. The arithmetic from dividing nominal numbers and the manufacturer's rated item need to be read separately. This page can't tell whether rounding or measurement conditions made the difference, and you must not rewrite the calculated result as if it were the manufacturer's figure either.
The agency list shows model name 9290037760 with an efficacy of 108.69lm/W and rated power of 8W, and model name 9290037761 with an efficacy of 114.89lm/W and rated power of 8W. This material alone can't tell how the agency's short model names correspond to the manufacturer's 12-digit product codes. So I did not merge the agency figures into the manufacturer table to make them look like measured values for the same product on sale. Match the exact model code and the report confirmation yourself.
Is the 67W in the product name the actual power consumption?
No. The Philips page title carries a label of bulb 67W A60 E26, but the product name in the specs is LEDBulb 8W and the power item is 8 as well. Don't carry the W in the title over as power consumption; read the power item in the specs. You need the habit of checking which item a number is attached to.
The official overall height and width in the specs are 104mm and 60mm for the 3000K product and 106mm and 60.5mm for the 6500K product. If you mix up package dimensions and bulb dimensions, it is hard to judge whether it fits in a small shade. Even if your existing bulb is E26, check the inner height and width of the shade and the allowed conditions of that lighting fixture.
What do you match before fitting it in your lighting?
If you are choosing the color of light between the two color temperatures on an E26 socket, the table above is a starting point for comparison. You can tell 3000K from 6500K at the same 750lm, but there is no basis for stretching that difference into better sleep or eye health. Decide the luminous flux you need and your preferred color temperature separately.
Both candidates are listed as non-dimmable products. If your lighting uses a dimmer control, you shouldn't pick these candidates, and you can't assume they fit a different socket or a shade the wrong size. After reading the energy numbers, just match the socket, dimensions, and dimmability in turn.
Product information
Candidates compared
-
Philips LEDBulb 8W E26 3000K A60 1PF/6 KR
-
Philips LED Bulb 8W Daylight, 6-Pack
Check price and stock at the link. Product information is as of the date checked.
Frequently Asked Questions
Does a higher color temperature mean brighter or more efficient?
Color temperature in K, luminous flux in lm, and efficacy in lm/W are different items. The two candidates differ in color temperature, but the nominal luminous flux of 750lm and the manufacturer's rated efficacy of 93lm/W are the same.
What is the calculated value for 750lm and 8W?
The arithmetic from the nominal values is 93.75lm/W. Read it separately from the 93 in the manufacturer's rated efficacy item.
Can I use the two candidates in a dimmable fixture?
The manufacturer's specs show dimmable as No for both candidates. You need to check separately for a dimmable product that suits the lighting fixture.
Sources & Verification Date
- Korea Energy Agency Energy Efficiency Management System Product Search · Verified
- Philips LEDBulb 8W E26 3000K A60 1PF/6 KR Official Manufacturer Specifications · Verified
- Philips LEDBulb 8W E26 6500K HPF A60 1PF/6 KR Official Manufacturer Specifications · Verified
All materials have been verified from official announcements and may have changed since verification.