{"id":11929,"date":"2026-09-09T11:22:18","date_gmt":"2026-09-09T11:22:18","guid":{"rendered":"https:\/\/new-lights.com\/blog\/led-filament-vs-incandescent-energy-use\/"},"modified":"2026-09-09T11:22:18","modified_gmt":"2026-09-09T11:22:18","slug":"led-filament-vs-incandescent-energy-use","status":"publish","type":"post","link":"https:\/\/www.new-lights.com\/ar\/blog\/led-filament-vs-incandescent-energy-use\/","title":{"rendered":"LED Filament vs Incandescent Bulbs: Energy Use Compared"},"content":{"rendered":"

An LED filament bulb usually uses much less electricity than an incandescent bulb that provides a similar amount of visible light. The exact reduction is not one fixed percentage. It depends on the measured input power of the two lamps, whether their lumen output and distribution meet the same lighting task, and how long they operate.<\/p>\n

The fair sequence is light requirement first, watts second<\/strong>. Define the needed lumens, color, distribution, dimming behavior and fixture conditions. Then compare input power and calculate annual energy from the site\u2019s schedule. This method avoids treating \u201c60 W replacement\u201d as proof that two lamps will perform identically.<\/p>\n

LED Filament Bulb Is the Correct Term<\/h2>\n

The old expression \u201cletter bulb\u201d is not the standard name for this technology. An LED filament bulb uses narrow light-emitting strips arranged inside a clear, frosted or decorative envelope to echo the appearance of a traditional glowing filament. It also contains an electronic driver and other components needed to operate the LEDs.<\/p>\n

An incandescent lamp passes current through a tungsten filament and heats it until it emits light. The two products can share an A60, ST64, globe or candle shape, but their conversion of electrical energy into visible light is very different. The guide to what an LED filament is made of<\/a> explains the construction behind the visual similarity.<\/p>\n

\n \"Clear<\/a>
A clear A60 LED filament bulb from New Lights. Explore the LED filament bulb range<\/a> after defining the required shape, finish, cap and fixture conditions.<\/figcaption><\/figure>\n

Compare Lumens Before Watts<\/h2>\n

Watts measure electrical input power. Lumens measure the total quantity of visible light emitted. A lower wattage is useful only if the lamp still supplies the required light in the intended fixture.<\/p>\n

The US Federal Trade Commission\u2019s Lighting Facts guidance places brightness in lumens and energy use in watts. For covered lamps, the label also includes estimated yearly energy cost, life and light appearance. This is a better comparison framework than the old habit of buying brightness by incandescent wattage.<\/p>\n

Use a five-part screen:<\/p>\n

    \n
  1. Define the lumens required by the space or decorative task.<\/li>\n
  2. Confirm that the lamp\u2019s distribution works with the shade, reflector and mounting position.<\/li>\n
  3. Compare tested input watts among products that satisfy the first two conditions.<\/li>\n
  4. Check color temperature, color rendering, dimming and enclosure restrictions.<\/li>\n
  5. Calculate annual kWh from real operating hours and lamp quantity.<\/li>\n<\/ol>\n

    The article on choosing an LED bulb beyond the SMD label<\/a> provides a broader framework for balancing output, color and fixture fit.<\/p>\n

    What Official Comparison Data Shows<\/h2>\n

    The US Department of Energy\u2019s FEMP purchasing guide, updated in June 2023, provides a bounded comparison for A-type general-purpose replacement lamps with E26 bases. Its table pairs traditional incandescent wattages with ranges drawn from the ENERGY STAR product list available at that time. The ENERGY STAR lighting program later sunset at the end of 2024, so this table is a comparison reference rather than a current certification list.<\/p>\n

    \n\n\n\n\n\n\n\n\n
    Light output<\/th>\nIncandescent input<\/th>\nLED input range in the DOE table<\/th>\nComparison use<\/th>\n<\/tr>\n<\/thead>\n
    450 lumens<\/td>\n40 W<\/td>\n4.5\u20137 W<\/td>\nLower-output general replacement<\/td>\n<\/tr>\n
    800 lumens<\/td>\n60 W<\/td>\n5.9\u201310.5 W<\/td>\nCommon general-service reference<\/td>\n<\/tr>\n
    1,100 lumens<\/td>\n75 W<\/td>\n9.5\u201314 W<\/td>\nHigher-output replacement<\/td>\n<\/tr>\n
    1,600 lumens<\/td>\n100 W<\/td>\n10.5\u201318 W<\/td>\nHigh-output general replacement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

    The table shows the scale of the technology difference within its stated product set. A decorative LED filament lamp may use different optics, electronics, color specifications or envelope construction, so project calculations should replace the range with the exact model\u2019s tested lumens and input watts.<\/p>\n

    \n \"DOE
    DOE comparison ranges for A-type E26 replacement lamps show why equal-lumen comparison is more useful than comparing technology names alone.<\/figcaption><\/figure>\n

    Calculate Annual Energy Use<\/h2>\n

    For one lamp, use:<\/p>\n

    Annual energy (kWh) = lamp watts \u00d7 operating hours per day \u00d7 operating days per year \u00f7 1,000<\/strong><\/p>\n

    For a group of lamps, use:<\/p>\n

    Annual energy (kWh) = quantity \u00d7 lamp watts \u00d7 annual operating hours \u00f7 1,000<\/strong><\/p>\n

    Then calculate electricity cost:<\/p>\n

    Annual electricity cost = annual energy (kWh) \u00d7 electricity rate per kWh<\/strong><\/p>\n

    Suppose a site compares a documented 60 W incandescent lamp with a documented 9 W LED filament lamp that meets the same light requirement. At three hours per day for 365 days, one incandescent lamp uses 65.7 kWh per year, while one 9 W LED uses 9.855 kWh. The annual difference is 55.845 kWh per lamp.<\/p>\n

    If the site pays $0.15 per kWh, that difference corresponds to about $8.38 per lamp per year. Replace the wattages, hours and electricity rate with the project\u2019s values. A hotel or restaurant operating 100 decorative lamps for 12 hours per day will see a very different result from a residence operating four lamps for two hours per day.<\/p>\n

    \n \"Annual
    Use quantity, measured watts, annual operating hours and the site electricity rate to calculate the project rather than relying on a universal savings percentage.<\/figcaption><\/figure>\n

    Calculate the Reduction Percentage Correctly<\/h2>\n

    When the two lamps satisfy the same lighting requirement, calculate the direct power reduction as:<\/p>\n

    Energy reduction (%) = (incandescent watts \u2212 LED watts) \u00f7 incandescent watts \u00d7 100<\/strong><\/p>\n

    For the 60 W versus 9 W pair, the result is 85%. That number belongs to those two power inputs. Comparing 60 W with a 10.5 W LED produces 82.5%; comparing a different incandescent baseline changes it again.<\/p>\n

    A percentage without the compared wattages and lumen basis is difficult to audit. Product pages, quotations and project calculations should state the exact variants and assumptions beside the result.<\/p>\n

    Luminous Efficacy Explains the Difference<\/h2>\n

    Luminous efficacy is the lamp\u2019s lumen output divided by its input watts. An 800-lumen, 9 W lamp has an initial efficacy of about 88.9 lumens per watt. An 800-lumen, 60 W incandescent reference has about 13.3 lumens per watt.<\/p>\n

    Efficacy helps explain why LED technology can deliver similar total lumens with much lower power, but it does not describe where the light goes. A clear filament bulb usually distributes light broadly, while a shade or reflector can absorb or redirect part of the output. Compare useful illumination at the task, table, wall or room surface when distribution matters.<\/p>\n

    Clear and frosted envelopes can also change visual comfort and appearance without changing the basic calculation method. The clear versus frosted filament bulb guide<\/a> explains how the finish interacts with exposed and shaded fixtures.<\/p>\n

    Dimming, Smart Controls and Standby Power<\/h2>\n

    Incandescent lamps naturally become warmer in color as their output falls. A standard dimmable LED filament lamp may reduce output without the same color shift, while warm-dim or tunable products use different electronics. Compare minimum stable dimming level, color behavior, input watts, flicker and compatibility with the actual dimmer.<\/p>\n

    The filament LED dimming guide<\/a> explains why a lamp marked \u201cdimmable\u201d still needs a compatible control. Unstable combinations can flicker, buzz, fail to start consistently or operate outside their intended conditions.<\/p>\n

    A smart filament lamp can draw a small amount of power when its LEDs are off because the radio and control electronics remain available. For a precise fleet calculation, separate lit and standby periods:<\/p>\n

    Annual kWh = quantity \u00d7 ((lit watts \u00d7 lit hours) + (standby watts \u00d7 standby hours)) \u00f7 1,000<\/strong><\/p>\n

    Use documented or measured standby power for the exact model. Controls may still reduce total consumption substantially when they shorten operating hours through scheduling, occupancy response or reliable automatic shutoff.<\/p>\n

    Heat and Fixture Conditions<\/h2>\n

    Both lamp types release heat into or around the space, but an LED that uses less input power for the required light normally adds less total heat. The effect on air-conditioning energy depends on fixture location, season, operating schedule and HVAC efficiency, so report direct lighting kWh separately from any building-level cooling model.<\/p>\n

    Lower input power does not automatically approve a lamp for every enclosure. Totally enclosed fixtures trap heat and can raise the temperature around the LED driver. Check the lamp\u2019s packaging or technical specification for enclosure and ambient restrictions. The filament bulb fixture guide<\/a> covers cap, dimensions, orientation and open-versus-enclosed use.<\/p>\n

    Lifetime and Maintenance Need Their Own Model<\/h2>\n

    LED lamps commonly have longer rated lives than incandescent lamps, which can reduce replacement labor and inventory. Energy savings and maintenance savings should be shown as separate lines so decision-makers can see the assumptions behind each one.<\/p>\n

    Rated life is not a guaranteed service interval. Temperature, switching cycles, dimmer compatibility, voltage quality and driver design affect field results. IEC 62612 defines performance requirements and test conditions within its scope and distinguishes its test regime from a complete real-life lifetime test.<\/p>\n

    For a commercial comparison, request the rated-life definition, lumen-maintenance data, switching-cycle data, failure criteria, sample size, warranty terms and thermal restrictions. The filament LED lifetime article<\/a> explains how to translate rated hours into a maintenance plan.<\/p>\n

    A Procurement Comparison Table<\/h2>\n
    \n\n\n\n\n\n\n\n\n\n\n\n
    Input<\/th>\nWhy it matters<\/th>\nRecord for each candidate<\/th>\n<\/tr>\n<\/thead>\n
    Light output<\/td>\nEstablishes a comparable lighting task<\/td>\nInitial lumens and useful distribution<\/td>\n<\/tr>\n
    Input power<\/td>\nDrives direct lighting energy<\/td>\nTested or rated watts at the project voltage<\/td>\n<\/tr>\n
    Operating schedule<\/td>\nScales annual consumption<\/td>\nLit hours, standby hours and switching pattern<\/td>\n<\/tr>\n
    Controls<\/td>\nChanges power and operating hours<\/td>\nDimmer, sensor, relay, hub and compatibility<\/td>\n<\/tr>\n
    Fixture conditions<\/td>\nAffect output, temperature and service life<\/td>\nCap, enclosure, orientation and ambient range<\/td>\n<\/tr>\n
    Maintained performance<\/td>\nAffects long-term lighting quality<\/td>\nLumen maintenance, color change and failure criteria<\/td>\n<\/tr>\n
    Commercial inputs<\/td>\nComplete the financial model<\/td>\nQuantity, tariff, purchase price, labor and warranty<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

    A Practical Seven-Step Workflow<\/h2>\n

    1. Define the lighting requirement<\/h3>\n

    Record target lumens, distribution, color temperature, color rendering, fixture type and dimming behavior before comparing power.<\/p>\n

    2. Identify exact lamp variants<\/h3>\n

    Capture model, cap, voltage, wattage, envelope, finish and smart or dimmable features. Do not compare one product family name with another family\u2019s best-performing variant.<\/p>\n

    3. Verify performance data<\/h3>\n

    Match lumens and watts to the exact model and test basis. For US covered lamps, review the required Lighting Facts information and applicable test procedures.<\/p>\n

    4. Calculate direct annual energy<\/h3>\n

    Use quantity, actual hours and the local electricity rate. Show the inputs next to the result and include a sensitivity case when operating hours are uncertain.<\/p>\n

    5. Add controls and standby<\/h3>\n

    Account for dimming schedules, occupancy controls and smart-lamp standby power when they are material to the fleet.<\/p>\n

    6. Evaluate a representative sample<\/h3>\n

    Test the lamp in the intended fixture and control circuit. Check output, distribution, color, dimming, flicker, startup and thermal behavior. The LED lighting sample evaluation checklist<\/a> helps preserve the configuration and acceptance criteria.<\/p>\n

    7. Separate energy, maintenance and purchase cost<\/h3>\n

    Present direct electricity, replacement labor, lamp cost and any modeled HVAC effect as separate assumptions. This makes the comparison easier to update when tariffs, schedules or products change.<\/p>\n

    Frequently Asked Questions<\/h2>\n

    Do LED filament bulbs use less energy than incandescent bulbs?<\/h3>\n

    Usually yes when they deliver comparable lumens and suitable distribution. Calculate the exact difference from the two products\u2019 verified input watts.<\/p>\n

    Is a 6 W LED filament bulb equal to a 60 W incandescent?<\/h3>\n

    Not from watts alone. Compare tested lumens, distribution, color, dimming and fixture conditions. Some 6 W products target a lower light output.<\/p>\n

    Should I compare watts or lumens first?<\/h3>\n

    Start with lumens and the lighting task. Then compare watts among products that satisfy that requirement. Watts describe power, not brightness.<\/p>\n

    How much does one LED filament bulb save per year?<\/h3>\n

    Multiply the wattage difference by annual operating hours, divide by 1,000 and multiply by the electricity rate. The result changes with the exact lamps, schedule and tariff.<\/p>\n

    Does dimming reduce energy in direct proportion to light output?<\/h3>\n

    Not always. Driver behavior varies, and smart lamps may retain standby load. Use model data or measurements at the relevant settings.<\/p>\n

    Does lower energy use mean less heat?<\/h3>\n

    Lower input power generally means less total heat from the lamp, but fixture temperature and HVAC interaction need separate checks.<\/p>\n

    Final Comparison<\/h2>\n

    LED filament technology can retain the familiar exposed-filament appearance while using far less electricity than an incandescent lamp at comparable light output. A defensible comparison states the lumens, watts, hours, controls and fixture conditions behind the result.<\/p>\n

    For a project calculation, contact New Lights<\/a> with the required lumens, bulb shape, cap, fixture, annual hours, electricity rate and destination market. Those inputs support an exact model comparison and a transparent operating-cost estimate.<\/p>\n

    Editorial Sources<\/h2>\n
      \n
    • Federal Trade Commission, The FTC Lighting Facts Label: Questions and Answers for Manufacturers<\/em>: https:\/\/www.ftc.gov\/business-guidance\/resources\/ftc-lighting-facts-label-questions-answers-manufacturers<\/li>\n
    • US Department of Energy, Purchasing Energy-Efficient Light Bulbs<\/em>: https:\/\/www.energy.gov\/cmei\/femp\/purchasing-energy-efficient-light-bulbs<\/li>\n
    • ENERGY STAR, Learn About Brightness<\/em>: https:\/\/www.energystar.gov\/products\/learn-about-brightness<\/li>\n
    • IEC, IEC 62612: Self-ballasted LED lamps \u2014 Performance requirements<\/em>: https:\/\/webstore.iec.ch\/en\/publication\/7259<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Compare LED filament and incandescent bulbs by lumens, exact input watts, operating hours, controls and fixture conditions before calculating annual energy and cost.<\/p>","protected":false},"author":1,"featured_media":11927,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"page_builder":"","footnotes":""},"categories":[148],"tags":[],"class_list":["post-11929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-selection"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/posts\/11929","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/comments?post=11929"}],"version-history":[{"count":0,"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/posts\/11929\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/media\/11927"}],"wp:attachment":[{"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/media?parent=11929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/categories?post=11929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.new-lights.com\/ar\/wp-json\/wp\/v2\/tags?post=11929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}