1 ly = 9.4605x1015 m = 9.4605x1012 km (light year)
1 pc = 3.0857x1016 m = 3.0857x1013 km = 3.2616 ly = 206265 AU (parsec)
1 Mpc = 106 pc = 3.2616x106 ly (Megaparsec)
Angles:
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When buying lightbulbs, you''ll see commonly see several measurements listed on the packaging. Perhaps the most recognisable one, which has existed for decades, is the wattage. However, times are achanging, andinnovation has led us into updating how we rate and reference our bulbs. Enter the lumen.
The Watt is a unit of power. The Lumen is a measurement of light output. For our lightbulbs, the lumen defines the perceived brightness of a specific bulb (such as an LED fixture).
In the past, we commonly bought conventional bulbs on the basis of wattage. We knew that a 75W lightbulb produced more light than a 40W bulb. Over time, the technology involved in lightbulb manufacturing has improved to allow the productionof more energy-efficient bulbs (CFL, LED). These bulbs produce the same levels of brightness (lumens) as older incandescent and halogen bulbs, but with a fraction of the power (watts). As an example, to produce 480-720 lumens oflight might require 40W of power for an incandescent bulb, but only 6-7W for an energy-efficient LED bulb.
If you''re in the process of replacing your light bulbs, consider looking at our LED Savings Calculator to see how much money you could save on your energy bill by switching toLED lighting.
Now, it may be that you''ve been told you need a certain amount of lumens of brightness to light your room, and you may be wondering how what wattage lightbulb you should look for. That''s where a conversioncan come in handy to guide you.
If you want to carry out a conversion from lumens to watts, you can use the following formula:
lm/W stands for lumens per watt and is a unit measuring luminous efficacy and energy efficiency - how much visible light is produced for a given amount of electricity. As an example, a 60W incandescent light bulb may produce around 900lumens, giving it a luminous effacy of 900/60 = 15 lm/W.
When swapping out your old incandescent or halogen bulbs for more energy-efficient CFL or LED bulbs, you may wish to have a comparison to ensure you get the same level of brightness (lumens) from your bulb.To assist you, we have provided a handy conversion table below. Note that efficacy can vary, often wildly, between manufacturers. So, do check the ''lighting facts'' label on the bulb before you buy.
The luminous efficacy of a bulb will vary between manufacturers, but the below is an estimate of what you might expect to get. Note thatenergy-saving lamps can increase energy efficiency.
Luminosity, in astronomy, is a measure of the total power emitted by a light-emitting object, particularly by a star. The luminosity depends uniquely on the size and surface temperature of the object, and it''s measured in multiples of the Joule per second or in watts. However, as these values can grow pretty big, we often express the luminosity as a multiple of the Sun''s luminosity (L☉).n.
Absolute and apparent magnitude are methods to measure the brightness of a star.
We compute luminosity with the following formula:nL = σ · A · T4nwhere:
47.67 L☉. To find this result:
The result is Vega''s luminosity in terms of Solar luminosity.
Thanks to this calculator, you will also be able to determine the absolute and apparent magnitudes of stars.
Luminosity is a measure of the energy radiated by an object, for example, a star or a galaxy. For the stars of the main sequence, luminosity is directly related to their temperature – the hotter a star, the more luminous it is. On the other hand, cooler stars emit less energy – hence, it''s more challenging to spot them in the night sky.
We can derive the formula for stellar luminosity directly from the Stefan-Boltzmann law. This law states that for a black body, the energy radiated per unit time is equal to:
Our luminosity calculator uses a simplified version of this formula. Instead of calculating the energy as an arbitrary value, we can compare any star to the Sun. Then, after canceling out the constants, we arrive at the luminosity equation:
You can also use this tool as an absolute magnitude calculator. Absolute magnitude is a different way to measure luminosity. Instead of expressing it in watts, it can be shown on a logarithmic scale.
The lower the absolute magnitude, the more luminous the star is - some very bright stars can even have negative magnitudes! For example, the absolute magnitude of the Sun is equal to 4.74, and of Bellatrix to −2.78.
Absolute magnitude and luminosity are related to the formula:
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