Watts
The electricity used by a Lightbuldb is measured in "Watts", the output of the Light (i.e. the Light) is measured in "Candela".
The unit for intensity of light is candela(cd). However, bulbs are rated by their power usage which is measured in watts(W)
The power a light bulb consumes is measured in watts. Light output is often described in terms of watts, as wattage was the only measurement distinguishing different light bulbs in the years before CFL bulbs were commonplace.Light output may also be described in 'candlepower', although this unit of measurement is obsolete and was replaced by the 'candela' in 1948. 'Lumens' are the standard of light measurement in terms of what the human eye can perceive, and you may see these on light bulb packaging occasionally as well.Incandescent light bulbs are generally measured in watts, indicating the power consumed by the bulb.The amount of light of light produced is measured in lumens. Fluorescent bulbs produce more lumens per watt than incandescent. LED lights produce more lumens per watt than florescents.Watts.Watts
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with a theremometer
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Electrical power is measured in watts (W), just like any other type of power.Power is the rate at which energy is used. Energy is measured in joules (J), though utility bills usually measure energy using kilowatt-hours (kW·h) instead. 1 kW·h = 3,600,000 J.
Light travels in the form of discrete paritcles called photons. These are measured by a unit called quantum.
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The intensity of light is measured in lumens. The amount of energy in light can be measured in any unit of energy (BTU, calories, Joules, etc.) The energy per unit time can be measured in any unit of power (Watts, horsepower etc.) All of these are independent of specific classes of coordinate systems and hence "scalar".