13 Contributions. Literature is a beautiful and complex artistic expression. In ancient times, people would use symbols and pictures to portray a moment in time. Writing, however, gave us a wayâ¦ to convey not only documented history, but the feelings that went along with those moments.
Heat flux and radiative flux are specific cases of energy flux that involve the rate of transfer of heat and radiation (photons) respectively. Energy flux is a function of time as well as area, and has units of J/m 2 /s or W/m 2. It is sometimes also referred to as flux density. In more technical terms, flux density is defined as the energy travelling over an area perpendicular to the flow of energy divided by time and by area. Four types of energy fluxes for ideal (flat and smooth) surfaces have been identified so far.
The SI units for luminous flux are lumens, where a lumen is defined as a luminous intensity of one candela within a solid angle of one steradian. Luminous flux is often used to compare the lighting power of light bulbs.uminous flux is a measure of the perceived power of light or light intensity. Because luminous flux is the measure of a property in the perceived sense, it is adjusted to deal with the fact that the human eye is sensitive to many different wavelengths of light and in different ways.