Como converter lumens in watts

By contrast, the lumen is a unit of brightness, a measure of the total quantity of visible light emitted by a light source. Modern energy-efficient bulbs use much less power wattage when compared to their incandescent and fluorescent counterparts. As low-wattage bulbs become more commonplace, we need a better way of measuring their output. This is where the lumen comes in.

Figures for lumens appear on the packaging of all light bulbs and allow us to compare the brightness or dimness of a bulb. Let's imagine that you are looking for an extremely bright bulb that emits 1, lumens. For an LED bulb, producing 1, lumens will require around 15 watts of power.

However, for a less-efficient halogen bulb, over 60 watts of power are likely to be required to produce the same brightness. The cookies is used to store the user consent for the cookies in the category "Necessary".

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The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Since we used watt incandescent bulbs for so many years, we associated a certain level of brightness with 60 watts.

Instead, we need to use lumens. A lumen is a measure of visible light energy. The higher the lumens, the brighter the light. All lighting manufacturers are starting to tell us how many lumens are produced by each of their lighting products.

This is a measure of how well a light source converts energy watts into light lumens. So, LEDs are about times more efficient at producing light than incandescent bulbs. Use this or ratio as a rough guide when selecting an LED bulb to replace an incandescent bulb. For example, if you need to replace a watt incandescent bulb with an LED bulb, then divide 60 watts by 5 to get 12 watts — that will be a good estimate. This table shows a comparison of the power consumption and the respective brightness of all common light sources.

The values are average values of the respective lighting technology and vary by manufacturer. You will find the 60 watt bulb in the 3rd row of the 2nd column. It has a brightness of about lumens.

You will find the suitable LED replacement in the 5th column of the same row. With the same brightness, the LED only needs 7 to 9 watts, depending on manufacturer and model. You can find the 13 watt CFL bulb in the 3rd row of the 4th column. The brightness specifications for LED technology varies greatly depending on the quality of the light sources.

Due to the active development of LED technology, a further increase in lumens per watt can be expected in the coming years. The luminous flux or brightness in lumens indicates the intensity only. The direction or beam angle of the emitted light is not taken into account. So the lumen value says nothing about how the light is diffused in the room.

Old light bulbs and halogen lamps emit their light almost all around. Many LED lamps, on the other hand, have a lower beam angle. For this reason, the lumen value of an LED lamp can often be slightly lower than with the old light source. With a luminaire above the dining table for example, the table would be illuminated just as brightly as before, only the indirect lighting of the ceiling would be darker than before.