Company Name: ShenZhen GTL Lighting Technology CO.,LTD
Company Address: HuBin Industry NO.18 Shuiku Road FuYong Town Baoan Distict ShenZhen City China
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E-mail: xdw@gtl-led.com
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LED Basic Knowledge
GTL:Home>Products>LED Basic Knowledge
Brightness Often used incorrectly with respect to illumination as a synonym for luminous flux, an objective measurement of the visible power of a light source. The term is correctly used when describing screen brightness in a display or television
Color Rendering A general expression for the effect of a light source on the color appearance of objects.
Color Rendering Index (CRI) A measure of the degree of color shift objects undergo when illuminated by the light source as compared with those same objects when illuminated by a reference source of comparable color temperature. The reference source has a CRI of 100.
Color Spectrum / Visible Spectrum The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye, typically between 390nm and 750nm.
Color temperature The description used to describe the effect of heating an object until it glows incandescently, the emitted radiation, and apparent color, changes proportional to the temperature; easily envisioned when considering hot metal in a forge that glows red, then orange, and then white as the temperature increases.
Directional Light Source A light source that emits light only in the direction it is pointed or oriented.
Efficacy The light output of a light source divided by the total electrical power input to that source, expressed in lumens per watt (lm/W).
Flux / Luminous Flux Luminous flux is the measure of the perceived power of light, adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
Forward voltage
A widely accepted printed circuit board (PCB) material which is fiberglass reinforced epoxy laminates that are flame retardant.
Goniophotometer A photometric device for testing the luminous intensity distribution, efficiency, and luminous flux of luminaires.
Lumen (lm) The international (SI) unit of luminous flux or quantity of light and equals the amount of light that is spread over a square foot of surface by one candle power when all parts of the surface are exactly one foot from the light source. For example, a dinner candle provides about 12 lumens.
Lumen Maintenance The luminous flux at a give time in the life of the LED. This is expressed as a percentage of the intial luminous flux.
Lumen Maintenance Curve A graph illustrating the predicted average light output behavior over time of a single LED or solution.
Luminous Efficiency The percentage of total lamp lumens that a lighting fixture, luminaire, or system emits, minus any blocked or wasted light.
Power Factor The active power divided by the apparent power (i.e., product of the rms input voltage and rms input current of a driver).
Ultraviolet (UV) Electromagnetic radiation with wavelength shorter than that of visible light.
Ingress Protection grade(IP grade) IP grade is that the lamps was graded according to their dust-proof, anti-moisture characteristics .it was composed with two numbers, the first number represents the dust-proof and foreign objects intrusion degree of the lamp (0-6 grade),the second number represent the anti-moisture and waterpoof degree of the lamp (0-8 grade), the larger the number, the higher level of protection.
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