How to calculate the luminous flux of LED tube (Liu Mingzhi)?
The maximum value of Km for spectral luminous efficiency is equal to 683lm/W; V (lambda) is the standard spectral luminous efficiency standard prescribed by the international illumination Commission (CIE); e lambda is the spectral density of the radiation flux. The luminous flux unit is LM (Liu Ming); lambda is spectral luminous efficiency. 1lm is equal to the luminous flux emitted by a point light source with 1CD (Candela) uniform luminous intensity in the solid angle of 1sr (spherical) unit, that is, 1 lm=1 CD = Sr. The nominal luminous flux of an ordinary incandescent lamp of 40W is 360lm, and the nominal luminous flux is 2100 LM for 40 W day, while the luminous flux of 400 W standard high pressure sodium lamp is up to 48000 lm.Known luminous efficiency (lumen / watt Lm/W) and power (Watts W), then luminous flux = luminous efficiency * powerKnown illuminance (lumen / split meter Lm/MM) and area of illumination (M2 MM), then luminous flux = illuminance * areaLuminous flux calculation:The actual luminous flux of a luminaire (lamp lumen) / (single light source luminous flux * light source quantity), light point is that the actual luminous flux of the lamp is divided by the luminous flux that the luminaire should emit.For example: lamps have five 1W high-power light source, a single big light source luminous flux is 80LM, the whole lamp should be issued 80LM*5PCS=400LM, but when assembled into lamps, the actual light flux is only 350LM. This is the luminous efficiency. Then the light effect is 350LM/400LM=87.5%
Luminous flux refers to the amount of radiation flux that is evaluated in accordance with the international standard of human visual characteristics, expressed as a symbol phi (or Phi R). The relationship between luminous flux and radiation flux isTurn left and turn right |
The amount of light emitted by the LED light source in unit time is called the luminous flux of the LED light source. Unit: lumen, lm. The amount of light emitted by a light source in unit time is called the luminous flux of a light source. Similarly, this amount is for the light source, which describes the total amount of light source light and is equivalent to the optical power. The greater the luminous flux of a light source, the more light it emits.
