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Which LED type you use?
The wall pack use 3030SMD. The led flexible strip usually uses SMD 3528& 5050 LED, and only the SMD5050 led can do RGB Colorful changes. The LED Tube usually used SMD3014 LED, and SMD3528 & SMD5050 are also used for led tube.

How Long Do LEDs Last?
LED’s are extremely reliable by the nature of their design and the way they are constructed. Individual LED’s have very high life expectancy with very low failure rates. Light Source Rated Life (hours)*Incandescent750 to 2,000 Halogen incandescent 3,000 to 4,000 Compact fluorescent (CFL)8,000 to 10,000 Metal halide7, 500 to 20,000Linear fluorescent15,000 to 20,000High power white LED35,000 to 50,000.

Why are LEDs of some colors more expensive than LEDs of other colors?
One reason is that different semiconductor materials are used for different color LEDs, and some semiconductor materials are more expensive than others; another reason is that manufacturing costs are different. White LEDs are the most expensive because red, green and blue LEDs are combined together to make a white LED.

What do "cool white" and "warm white" mean, and what is CCT?
The Color Correlated Temperature (CCT) is given in the description of each of our white led bulbs. The color (CCT) of our white bulbs ranges from a warm yellow white (2700K) to a cool blue white (7000K).By comparison, a typical incandescent bulb has a CCT of 2800K. A typical halogen is a bit higher, maybe 3500K. Daylight white is 4500K and a cool white fluorescent is 6000K or more. The human eye adapts to background light so that even a daylight white bulb will look slightly blue in a room illuminated mainly with incandescent bulbs. Similarly, an incandescent bulb will look very yellow or even orange in midday sunlight.

Common use of LED parameters: Luminous Flux, Luminous intensity, Luminance, Llluminance, Color temperature, Color rendering.
Luminous Flux is a quantitative expression of the brilliance of a source of visible light, which is electromagnetic energy within the wavelength range of approximately 390 nanometer s (nm) to 770 nm. This quantity is measured in terms of the power emitted per unit solid angle from an isotropic radiator, a theoretical point source that radiates equally in all directions in three-dimensional space. The standard unit of luminous flux is the lumen (lm).
Luminous intensity is an expression of the amount of light power emanating from a point source within a solid angle of one steradian. the candela was defined and adopted as the standard unit of luminous intensity. One candela (1 cd) is the magnitude of an electromagnetic field ( EM-field ), in a specified direction, that has a power level equivalent to a visible-light field of 1/683 watt (1.46 x 10 -3 W) per steradian at 540 THz.
Luminance is the luminous intensity, projected on a given area and direction. Luminance is an objectively measurable attribute. The unit is ‘Candela per Square Meter‘ (cd/m2). So, different monitors can be adjusted to the same luminous intensity by measuring the luminance in cd/m2.
llluminance is the total luminous flux incident on a surface, per unit area. It is a measure of the intensity of the incident light, wavelength-weighted by the luminosity function to correlate with human brightness perception. Light EffectLight Effect is the rate of the electronic power turning into the light power, It is unit as "lm/W".
Color temperature is a simplified way to characterize the spectral properties of a light source. While in reality the color of light is determined by how much each point on the spectral curve contributes to its output, the result can still be summarized on a linear scale. Standard unit for color temperature is Kelvin (K).
Color rendering: Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference illuminant Standard unit for color temperature is Ra.

Energy efficiency of light sources, Typical Luminous Efficacy Range (Lm/W).
Energy efficiency of light sources is typically measured in lumens per watt (lm/W), meaning the amount of light produced for each watt of electricity consumed by the light source. This is known as luminous. 

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