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Rainbow-Light Lumen Introduction

Rainbow-Light is Taiwan supplier and manufacturer in Optical measuring instrument appliance industry. Rainbow-Light has been offering our customers high quality Spectrometer, UV spectrometer, Infrared Spectrometer, Visible Spectrometer, Fiber Spectrometer, Integrating Sphere, Goniophotometer, Color Measurement, Absorbance Spectrometer, Transmittance Spectrometer, Reflectance Rate Spectrometer, Material Identified Instrument since 2012. With both advanced technology and 20 years experience, Rainbow-Light always make sure to meet each customer's demand.


Rainbow-light equipment for measuring luminous flux.
Rainbow-light equipment for measuring luminous flux.

Lumen (ΦV)

The luminous flux and the radiation power, luminous flux is mainly human feel light power. A large number of people with normal vision, the vision of the most sensitive wavelength is about 555.0nm the green light, the human nature of the wavelength spectrum sensitivity of different visual function by V (lambda) light said. Is the amount of radiation power with visual function V (lambda) physical quantity weighted. The provisions of the international unit of luminous flux, the symbol is Phi units, lumens (LM).

Refers to the luminous flux per unit time by the light emitted by the light source, representing a total amount of light emitted by the light emitting body, the unit with the lumen said. Calculation is the radiant flux through the visual function. One lumen is equal to one candle uniform point source radiation for a solid angle radian in the light flux.
In general, you can use a spectrometer to match an integrating sphere or to use a light meter to measure the flux

The luminous flux represents the total power of light; unit of luminous flux is the lumen (lm). The formula is Radiant flux multiply Luminosity function.

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  • Light Flux Integrating Sphere System - Rainbow-Light light flux integrating sphere system is a integrating sphere measuring system of desktop  and small size.
    Light Flux Integrating Sphere System
    LSM-05, LSM-06

    Rainbow-Light launched the flux integrating sphere system for the absolute flux parameters for light source spectrum measurement products (LSM-05/06) by using “Micro Electro Mechanical System (MEMS)” technology, provides small volume, seismic resistance and portability. The flux integral ball system (LSM-05/06) has excellent stability, low correction demands to save a lot of correction costs and a high resolution (0.8~1.5 nm FWHM).The flux integrating sphere system (LSM-05/06) adapts to various environment. Spectral deviation is plus or minus 0.1 nm. Stability testing data also is within 4/10000 of the standard. It adapts to various environments.The flux integrating sphere system (LSM-05/06) consists of spectrometer, integrating sphere, I/O control module and the light source. The function of I/O control module is to open light source while measuring to avoid light too long caused decay phenomenon of inaccurate. I/O control module can also be in accordance with the user needs to control a variety of AC/DC power supply, button, switch, infrared sensors and so on by USB device.