Are friend interested in one energy efficient lighting systems for your organization, business, or facility?

Picking the most effective lighting starts through a thorough knowledge of power terminology as it relates come electricity. The four huge measures you need to be aware of room Joules, Watts, Watt-Hours, and Lumens/Watt. We"ll break them under one in ~ a time below.

You are watching: 1 kwh is how many joules?

Joules (J):

Joules room the SI (International mechanism of Units) unit that energy. Castle are characterized as 1 Joule = 1 kg·m2/s2. If you’re came to with energy effectiveness in lighting, what you’re really trying to carry out is to minimize the total variety of Joules you consume if maximizing the effective light output.

Watts (W) and Kilowatts (kW):

Watts room the SI unit that power. Kilowatts are indistinguishable to 1,000 Watts and are the most typically used unit of electrical power. Strength in basic is identified as power over time. Watt are defined as 1 Watt = 1 Joule per 2nd (1W = 1 J/s) which means that 1 kW = 1000 J/s. A Watt is the quantity of power (in Joules) the an electrical machine (such together a light) is burning per 2nd that the running. Therefore a 60W pear is burning 60 Joules of power every 2nd you have it turned on. In return, you gain a details amount that light, additionally known as luminance. For more on luminance and also an even more important measure up (foot-candles), check out here.

Example: If a room has actually one hundreds 40W irradiate bulbs running at once, you room using 4000 watt (4000 Joules/second). Imagine getting the exact same (or better) lighting quality by using one hundreds 5W lights instead. Currently you’re just burning 500 watts. That’s only 12.5% together much energy as friend were utilizing before; a savings of 87.5%!

Watts are critical part of arising your project and product criteria- learn much more here!

Watt-Hours (Wh) and Kilowatt-Hours (kWh):

Imagine you have actually your 60 Watt bulb on for whole hour. Go into a new, and also sometimes confuse term, “Watt-hours.” due to the fact that you ran a 60 Watt bulb for 1 hour, you have actually used 60 Watt-hours the energy (not power). If the owner of a large building (such together a manufacturing facility or genuine estate development) is do the efforts to minimize their power footprint, they desire to minimize the number of Watt-hours they space burning throughout a offered 24 hour period. This is the very same thing together saying they desire to minimize the number of Joules they space consuming; that is simply a different, an ext common unit the measurement. 1 Watt-hour is equal to 3600 Joules (3.6kJ). One Kilowatt-Hour is the same as 1,000 Watt-hours and is the most typical unit supplied in electric energy consumption.


This is a unit of measurement for a term referred to as luminous efficacy (you deserve to read about it in detail here). Luminous efficacy is a quantity that explains the lot of illumination (lumens) that you gain for a offered amount of strength (watts). All else being equal, you desire to maximize lumens when minimizing the power compelled to develop them.

See more: What Is Minus 23 Celsius In Fahrenheit To Celsius Conversion

Different tools require different quantities of strength to do them run. In addition, different devices emit a various quantity and also quality the light for a offered power setting. Other significant considerations incorporate off-the-shelf price, lifespan, and also maintenance/replacement costs. For a an ext in-depth discussion on the most energy effective lighting solutions, visit united state at Stouch lighting or try our ROI calculator. We’re below to help!