LED injection molding modules are commonly used lighting products that we can often see, such as light-emitting products in subway light boxes, light-emitting products in airport signs, and various signs in streets and alleys are all LED injection molding modules. He has brought infinite light and fun to our cities and villages! This is what we can feel. If we need a deeper understanding of LED injection molding modules, we need to start learning from its professional terms.

A. The spectral distribution of light radiation of LED injection molding module has its own unique side. It is neither monochromatic light (like lasers) nor broad-spectrum radiation (like incandescent lamps), but somewhere in between: there are bandwidths of tens of nanometers, with peak wavelengths in the visible or near-infrared region. LED spectral characteristics characterize the pros and cons of its monochromaticity and whether its main color is pure.

B. The relative spectral energy of the LED injection molding module. The general light source is a polychromatic light mixed with different wavelengths of color light. If the intensity of each color light in its spectrum is measured with a sensor, the radiation of different wavelengths of color light can be obtained. energy value. If φe represents the radiant energy of light, and λ represents the wavelength of the spectral color, then it is defined: the ratio of the radiant energy in the small wavelength range centered on the wavelength λ to the width of the wavelength is called the spectral density. Written in mathematical form: φe(λ)=dφe∕dλ (W/nm) The spectral density represents the magnitude of the radiant energy in the unit wavelength range. Usually, the radiant energy of different wavelengths of color light in the light source changes with the change of wavelength. Therefore, the spectral density is a function of wavelength. The functional relationship between spectral density and wavelength is called spectral distribution.

C. The peak wavelength (λp) of the LED injection molding module, unit: nm, the light emitted by the LED is not a single wavelength, and the wavelength corresponding to the maximum spectral luminous intensity or radiant power is the peak wavelength, which is represented by λp.

D. The dominant wavelength (λd) of the LED injection molding module, unit: nm, is mixed with a certain standard illuminator (such as CIE standard illuminator A, B, C or D65) according to a certain spectral color The sample color is matched, and the wavelength of the spectral color is the dominant wavelength of the sample color. In CIE1931 horseshoe coordinates, the extension line from point E (0.33, 0.33) to the measured object has an intersection with the horseshoe curve, and the wavelength corresponding to the intersection is the dominant wavelength of the sample. The dominant wavelength of a color is equivalent to the hue (psychological quantity) of the color observed by the human eye.

E. Half width (△λ) of LED injection molding module, unit: nm, at ±△λ on both sides of the peak of the LED spectrum line, there are two points where the radiation power is equal to half of the peak value (maximum light intensity). Corresponding to λp-△λ, λp+△λ respectively, the width between them is called spectral line width, also called half-power width or half-height width. The half-height width is a parameter that reflects the monochromaticity of the LED.

F. The luminous flux (Φ) of the LED injection molding module, unit: lumen/Lm, is the rate of light energy emitted by a light source or the flow rate of light, which is the basic quantity to describe the ability of the light source to emit light, that is, the light source emits light per second The total amount of visible light.

G. The luminous intensity (Iv) of the LED injection molding module, unit: candela (cd), the visible light emitted by the light source in all directions, in a certain direction, the luminous flux emitted within the unit solid angle dΩ is dΦ, then the point light source is in this The luminous intensity Iv in the direction is:

Iv=dΦ/dΩ

H. The illuminance (E) of the LED injection molding module, unit: lux (lx) The size of the luminous flux received by the unit irradiated area: E=dΦ/dA 1lx=1lm/m2

I. Luminance (L) of LED injection molding module, unit: candela∕square meter (cd/m2), which describes the spatial distribution of visible light emitted by a luminous body with a limited size. Definition: The ratio of the luminous intensity Iv of the unit luminous area dA in the θ direction to the projection cosθdA of the unit area on the plane perpendicular to the direction:

L=Iv/cosθdA

The above is an introduction to the professional terms of LED injection molding modules. If you need more detailed information about LED injection molding modules, please consult Shenzhen SUNLITE Optoelectronics Co., Ltd. Shenzhen SUNLITE Optoelectronics Co., Ltd. is a company dedicated to LED light box lighting, logo A high-tech enterprise engaged in the research and development, production, sales and service of lighting and decorative lighting products. Our website is http://en.sunlite-led.com, welcome to consult.