In the calculator, select Watts to Lumens as the conversion type, enter the value 35 and select the item Light bulb for comparison. If you already have some LED lamps on your shortlist, you can convert their lumen value into the output (in watts) of previous lighting.Įxample 2: You have a torchiere with two 35W bulbs and want to replace them with LED lights. So you can calculate how many lumens the new LED lamps should have based on your previous lights. This free online calculator will help you convert lumens to watts and vice versa. The Lumens to Watts Calculator helps you to compare the brightness of different light sources. The brightness in lumens is super important when using LED lamps. You can use the lumen value to compare the brightness of different lamps, regardless of their efficiency and lighting technology. The lumen specification is often given in the short form lm. For LED luminaires and illuminants, this must always be stated in the product description. ![]() This is the power emitted per second in the wave range of visible light. The unit lumen describes the luminous flux emitted by a light source. This is possible because lamp A could have a better efficiency due to high quality components and therefore emits more light. For the comparability of LED lamps the actual brightness is indicated in lumens. Different components in various LED lamps lead to varying brightness with the same power consumption.įor example, a 5W LED illuminant of type A can light up much brighter than another 5W LED lamp of type B. But the wattage plays a minor role now and only allows a very rough conclusion on the actual brightness. The replaced lamp was just as bright as before and there was no need to worry about the correct brightness.įor LED lamps, the power consumption is also indicated in watts. If a 60W bulb fails, it could be simply replaced by a new 60W bulb. Here the wattage was the most important indicator for the brightness. Old light sources such as incandescent bulbs or halogen lamps were easy to choose. Reading lights tend to be marked 5000-6500K these appear much bluer and perceived as brighter.Scroll to the lumens to watts calculator Convert lumens to watts For whiter light – more akin to daylight – good for kitchens and workspaces, bulbs labelled between 3500-4100K would be best. Incandescent bulbs are around 2700-3000K and produce a yellower warm/soft light, great for creating a relaxed ambiance. Light colour is measured using a temperature scale called Kelvin (K). Choosing the colour temperature of bulbsĬhoosing the right colour is dependent on the atmosphere you’re trying to create within your room, or what the space you are lighting is used for. Bulbs that are nearer to daylight (bluer or cooler in colour) sometimes appear brighter than yellower coloured lights. The colour of light can also affect how bright a light appears, even if the lumens are the same. Incandescent Bulb Wattageĭata sources: American Association of Physics Teachers 1996 and Energy Star 2016 What else can affect brightness perception? An equivalent compact fluorescents (CFL) bulb in light output (lumens) should consume only around 7 watts and LEDs approximately 6 watts. Wattage to Brightness ComparisonĪ 40 watt incandescent filament bulb produces roughly 460 lumens. Some of the most energy to light efficient LED bulbs are now reaching over 120 lumens in Energy Star tests. On average, an incandescent bulb produces around 14 lumens per watt, compared to 63 lumens for energy saving compact fluorescents (CFL) and 74 for LED bulbs. Most of us have a preconception of how bright a 100-watt incandescent bulb is even though this can vary tremendously between soft white and clear glass bulbs. Lumens is an accurate way of measuring the light output of bulbs – brightness is what we perceive, luminance is what we measure. They come in varying technologies, such as Compact Fluorescent (CFL), Halogen and LED and they last much longer – up to 25 years for LEDs!ĭefining the brightness, or light output of bulbs is changing from wattage equivalents to lumens. Nowadays, energy saving bulbs produce far more light, less heat, whilst consuming less energy (Watts). In recent years choosing light bulbs has become far more confusing – you knew roughly what you were getting with a 40, 60 or 100 wattage filament bulb. ![]() Household cost based on 12 bulbs.Įlectricity costs are calculated using the UK: Price Cap (Oct 2023) electricity rate of £0.27 per kWh (incl. ![]() *lumens conversion based on averages of Energy Star LED/CFL testing data 2016
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