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    Renovopedia
    Home » When Does Wattage Matter?

    When Does Wattage Matter?

    November 29, 2021No Comments Skills & Specialties
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    Watts do matter when it comes to paying your electric bill. That’s because a watt is a unit of power. The number of watts you use in a month are added up, and that’s what you’re charged for.

    Watts also matter when you’re choosing a light bulb to use in a fixture that has a maximum wattage limit or when you’re replacing one of the bulbs in a multi-bulb string, such as your Christmas tree lights.

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    When Watts Don’t Matter

    When it comes to how much light you get from a light bulb, watts don’t matter. Light isn’t measured in watts. It’s measured in foot-candles or lumens. One foot-candle, as the name implies, is the equivalent of the light from one candle, measured at a distance of 1 foot from the center of the flame. One lumen is the amount, or flow, of light that distributed uniformly, produces illumination of 1 foot-candle on every point across over 1 square foot of surface area.

    For years—ever since electric lights replaced gas lights—you’ve heard about light in terms of bulb wattage, especially when we’re talking about incandescent lights. You might think that you want a 60-watt bulb in a lamp, for example, when what you’re really after is for that lamp to be as strong as what you’re used to seeing from a lamp with a standard 60-watt incandescent bulb in it.

    It’s become a habit, for most of us, to think of the amount of light that way. We’re so used to conceptualizing and describing light amounts in watts that most people don’t even stop to think about it. Thus, to give us a frame of reference for the amount of light we’ll get from an alternative source such as compact fluorescent (CFL), halogen, or LED light bulb, manufacturers will often say that their newer bulb is a “60-watt equivalent.”

    That means this bulb produces approximately the same lumens as a standard 60-watt incandescent bulb. The amount of light you’re going to get from the bulb is the most important thing we look for when we’re shopping for a replacement.

    Understanding the Labels

    What the company isn’t telling us in that statement about equivalency is any real data. You’ll have to look for that elsewhere on the package or, sometimes, on the bulb itself.

    • Lumens: The lumens the bulb emits should be printed somewhere on the package. For reference, most old-fashioned 60-watt bulbs produced between 750 and 1,049 lumens, with the average being 800 to 850 lumens. The lumens they list for the one you’re looking at can be compared to those numbers to give you a sense of how much light you’ll be getting from the new bulb.
    • Watts: If the bulb isn’t an incandescent bulb, it won’t draw 60 watts. The watts it will draw will be printed somewhere on the package. For most CFL bulbs, the actual power draw is about 25 percent of the “equivalent” incandescent bulb. The 60-watt equivalent Bright from the Start CFL light bulb from GE, for example, uses exactly 15 watts per hour.
    • Efficiency: The efficiency of any light bulb is the amount of light it emits compared to the amount of power it uses. It is the lumens divided by the watts or the lumens per watt. Once you’ve got the lumens and the watts, you can calculate the efficiency. It probably won’t be printed on the package.
    • Color Temperature: The color temperature of light its temperature in degrees Kelvin. Without putting too fine a point on it, “soft white” light is usually about 2700K. A “bright white” light might be around 3500K. “Natural light” and “Daylight” can range from 4100K up to 6000K. This is the number that will tell you how red (yellow) or blue the light will appear, and the one you want is just the one you think you’ll be most comfortable with.

    Sometimes watts matter. When it comes to the amount of light you’ll get, though, they don’t.

    Source: The Spruce

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