The power per unit of energy produced by a laser transmitted to the surface of the skin, eye, or into the eye. joules.

the density of radiation incident on a given surface, irrespective of direction

is the radiant flux incident upon a unit area of a surface. For sunlight it is the number of watts received per square metre of the Earth's surface.

The radiant flux per unit area, a measure of the EM radiation that strikes a surface, measured in wafts per square meter.

Radiant flux density incident on a surface. Watts per square meter. (W/m2).

see specific flux Bestrahlungs- dichte

The instantaneous energy available from sunlight at the surface of the earth per unit area per unit time, measured in Watts per meter squared.

Irradiance is a measure of radiometric flux per unit area. Irradiance is typically expressed in W/cm (watts per square centimeter).(empty)(empty)

The radiant power density incident on a surface (W cm-2).

The direct, diffuse, and reflected solar radiation that strikes a surface.

the total incident radiant flux, in watts per square meter, received on a unit area of a surface

The radiant power density incident on a surface (watts/cm square).

the rate at which radiant energy arrives at a specific area of surface during a specific time interval. This is known as radiant flux density. A typical unit is W/m2.

The solar power incident on a surface. Usually expressed in kw/m². Irradiance multiplied by time equals Insolation.

Light energy per unit area per unit wavelength interval (W m-2 nm-1) from all directions. See Radiance.

The energy per unit time (or Watts) incident upon a unit area of a given surface, denoted by E = dQ/dt/dA and measured in MKS units as Watts/m2.

The solar power incident on a surface. Usually expressed in kilowatts per square meter. Irradiance multiplied by time equals Insolation.

the amount of solar energy that strikes a surface during a specific time period. Measured in kilowatts.

The density of radiant flux incident on a surface.

The intensity of radiation impinging on a surface, the rate of impact of radiation.

(Or radiant flux density.) A radiometric term for the rate at which radiant energy in a radiation field is transferred across a unit area of a surface (real or imaginary) in a hemisphere of directions. In general, irradiance depends on the orientation of the surface. The radiant energy may be confined to a narrow range of frequencies (spectral or monochromatic irradiance) or integrated over a broad range of frequencies. Irradiance follows from radiance but not, in general, vice versa. The photometric equivalent of irradiance is illuminance, obtained by integrating spectral irradiance times luminous efficiency over the visible spectrum. See Poynting vector.