Mechanical Equivalent of Light definition of Mechanical Equivalent of Light in the Free Online Encyclopedia.

mechanical equivalent of light [mi′kan·ə·kəl i′kwiv·ə·lənt əv ′līt]

(optics)

The ratio of the radiant power emitted by a monochromatic light source whose wavelength is that at which the sensitivity of phototopic vision is greatest (about 555 nanometers), to its luminous flux measured in lumens.

Mechanical Equivalent of Light

the ratio of the radiation flux in the visible region of the spectrum to the luminous flux produced by this radiation. The concept of the mechanical equivalent of light is usually applied to monochromatic light and this equivalent is a function of the wavelength ; of the light; the inverse function—the ratio of the luminous flux to the radiant flux—is called the spectral luminous efficiency of the radiation (or the spectral sensitivity of the average eye, the lumen equivalent of the power, or the luminosity of the radiation). The mechanical equivalent of light has its minimum value (0.00147 watt/lumen) at ; = 555 nanometers (the spectral sensitivity of the eye is a maximum at this wavelength).

Mentioned in	?		Encyclopedia browser	?		Full browser	?
No references found			mechanical analysis mechanical application mechanical area mechanical bearing cursor mechanical birefringence mechanical bond mechanical classification mechanical classifier Mechanical Comparator mechanical computer mechanical connection mechanical core mechanical damping mechanical dewaxing mechanical dialer mechanical differential analyzer mechanical draft mechanical drawing mechanical dysmenorrhea mechanical efficiency mechanical energy mechanical engineering mechanical equation of state mechanical equipment room Mechanical Equivalent of Heat Mechanical Equivalent of Light mechanical erosion mechanical expression mechanical filter mechanical flotation cell mechanical gripper mechanical hygrometer mechanical hysteresis mechanical impedance mechanical instability mechanical integrator mechanical jamming mechanical joint mechanical keyboard mechanical lift dock mechanical linkage mechanical loader mechanical mass mechanical metallurgy mechanical modulator mechanical mouse mechanical mucking mechanical mule Mechanical Musical Instruments mechanical ohm mechanical oil valve			Mechanical Engineering and Applied Mechanics Mechanical Engineering and Engineering Mechanics Mechanical Engineering Computer Aided Design Mechanical Engineering Congress and Exposition Mechanical Engineering Department Heads Mechanical Engineering Department Heads Committee Mechanical Engineering Design Project Mechanical Engineering Reference Manual Mechanical Engineering Services Mechanical Engineering Team Mechanical engineering technology Mechanical Engineering Technology Department Heads Mechanical Engineering Technology Department Heads Committee Mechanical Engineering, Aeronautical Engineering and Mechanics Mechanical engineers Mechanical engineers mechanical equation of state Mechanical equilibrium Mechanical equilibrium Mechanical Equipment Mechanical Equipment and Subsystem Integrity Program Mechanical Equipment Center Mechanical Equipment Manufacturers Representatives Association Mechanical Equipment Operator Mechanical Equipment Room Mechanical Equipment Room Mechanical equivalent of heat Mechanical equivalent of heat Mechanical Equivalent of Light mechanical erosion Mechanical Evaluation Surface Support Area Mechanical Event Simulator mechanical expression Mechanical Extract Ventilation mechanical extraction mechanical factors bone changes mechanical factors bone changes mechanical factors bone changes Mechanical Failure Prevention Technology Mechanical Failures Prevention Group Mechanical filter Mechanical Fingerprint mechanical flotation cell Mechanical Flow Diagram Mechanical Forensics Engineering Services, LLC mechanical fragility mechanical fragility mechanical fragility mechanical fragility Mechanical Front Wheel Drive Mechanical Front-wheel Drive Mechanical fuel injection Mechanical fuel pump Mechanical fuel pump mechanical gas admission valve mechanical gripper Mechanical Ground Support Equipment Mechanical Ground Support System Mechanical hackamore