radiant flux

Thus, a 60 watt light bulb emits a total radiant flux of about 45 watts.

A radiometer is a device for measuring the radiant flux (power) of electromagnetic radiation.

'If the fire was energetic enough to project flames to the ceiling, then we're talking about a high radiant flux.

In some systems of units, luminous flux has the same units as radiant flux.

It is obtained by dividing the luminous flux by the radiant flux.

The efficiency is the ratio between the incoming radiant flux (measured simply in watts) and the outgoing wattage.

Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux.

The ratio of the total luminous flux to the radiant flux is called the luminous efficacy.

Chemical actinometry involves measuring radiant flux via the yield from a chemical reaction.

During operation, at high temperature and radiant flux, metal ions tend to penetrate the silica, depleting the inside of the tube.

The radiance of an optical system is equal to the derivative of the radiant flux with respect to the etendue.

In optics, or radiometry, the term power sometimes refers to radiant flux, the average rate of energy transport by electromagnetic radiation, measured in watts.

It is defined as the ratio of the radiant flux (i.e., the total optical output power) to the input electrical power.

If the source emitted uniformly in all directions, the total radiant flux would be about 18.40 mW, since there are 4π steradians in a sphere.

Luminous flux (photometric) and radiant flux (radiometric)

Watts are units of radiant flux while lumens are units of luminous flux.

Ludwig Boltzmann derives the Stefan-Boltzmann law on blackbody radiant flux from thermodynamic principles.

Its visible and infrared spectrometers and violet photometers measured the up- and downward radiant flux from an altitude of 145 kilometers down to the surface.

In radiometry, radiant flux or radiant power is the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light).

Light with wavelengths outside the visible spectrum reduces luminous efficacy, because it contributes to the radiant flux while the luminous flux of such light is zero.

Typical variables to be optimized at the target include the total radiant flux, the angular distribution of optical radiation, and the spatial distribution of optical radiation.

The solar luminosity, L, is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars.

For Lambertian surfaces, the same factor of relates luminance to luminous emittance, radiant intensity to radiant flux, and radiance to radiant emittance.

The SI unit of radiant flux is the watt (W), which has dimensions of energy/time or, in SI units joules/second.

About eighty-eight percent of all arsons are up from the floor, in other words the radiant heat flux . . .' 'What the hell's radiant flux?'