Product Technology

3.1 What LED type you use?

At present,the led spot light and led bulb,usually uses 1W high power LED;
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, 1W high power led & 5mm DIP led are rarely used for LED Tube.
LED Street Bulb and LED Ceiling Light usually uses 1W High Power LED ;
LED Panel Light usually uses SMD 5050 LED,and it 's use LGP for light Uniform scattering

3.2 Introduce the Products Working Voltage?

The LED Spot Light,LED Street Bulb,LED Tube and LED Ceiling Light,LED Panel Light, in the normal working voltage scope (rated voltage in ¡À20%), the Light Fixture may match with our bulb directly, then replace directly.
The LED Flexible's working voltage is DC 5V ,LED Module uses DC5V or DC12V.

3.3 Are there only two kinds of working voltages(110v and 220v)? And can we use other working voltages?

Some Products can work within the range in 85-265 VAC ,277V AC, DC 24V,If you need to specify the operating voltage,please contact us.

3.4 Comparison Between SMD 3528 and SMD 5050 LED Strip Lights

Items;	SMD3528 (300 LEDs)	SMD5050 (150 LEDs)	SMD5050 (300 LEDs)
Dimensions	5000mm*8mm*2.2mm	5000mm*10mm*2.0mm	5000mm*12mm*2.0mm
LED Qty	300 pcs	150 pcs	300 pcs
Viewing Angle	120¡ã	120¡ã	120¡ã
Voltage	DC 12V	DC 12V	DC 12V
Current(A)	2Amp	3Amp	6Amp
Power Consumption	24 watt	36 watt	72 watt

SMD3528	Brightness(mcd)	SMD5050	Brightness(mcd)
RED	1000-1200 mcd/LED	RED	3000-4000 mcd/LED
Yellow	1000-1200 mcd/LED	Yellow	3000-4000 mcd/LED
Blue	400-600 mcd/LED	Blue	2500-3500 mcd/LED
Green	1500-2000 mcd/LED	Green	4000-5000 mcd/LED
White	1600-2000 mcd/LED	White	4000-5000 mcd/LED
Warm W	1600-2000 mcd/LED	Warm W	4000-5000 mcd/LED
		RGB	2500-3500 mcd/LED

3.5 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.

3.6 We have seen so many advantages LEDs have over incandescent light and florescent bulbs, are there any disadvantages LEDs exhibit compared with incandescent or florescent bulbs?

Yes, the most significant disadvantage is the light output limitation of LEDs. Currently available LEDs emit limited amount of lights at a relatively small angle range, while incandescent and florescent light bulbs illuminate in all directions. The second significant disadvantage is the high prices of LEDs. The currently available LEDs in the market are 3 ~ 10 times more expensive than equivalent incandescent light bulbs. This is why some customers still hesitate to buy LED products even though LEDs have so many obvious advantages over incandescent bulbs and people actually can save money by using LED products in the long run.

3.7 What are the advantages of LEDs compared with conventional incandescent lights?

There are several obvious advantages LEDs have over traditional incandescent light bulbs, they are as follows:
? Low power consumption - energy saving;
? Long lasting,
? Cold lighting,
? Ruggedness,
? Small size and weight,
? Fast switch times,
? Simple to use.

3.8 LED Tube T5,T8,T12 , What does it mean ?

Actually, T stands for the diameter of the LED tube, and each T represents one-eighth inch. So T8, the most familiar LED tube to us, is one inch(eight times one-eighth inch) in diameter. As we all know, one inch equals 25.4mm. Therefore, the diameter of T8 is 25.4mm. T12 means that the diameter of fluorescent tube is 12 / 8 inches. T5 obviously means that the diameter of LED tubes is 0.625 inches.
T12 Diameter of 38.1 mm
T10 Diameter of 31.8 mm
T8 diameter of 25.4 mm
T5 diameter of 16 mm
T4 diameter of 12.7 mm

3.9 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)*
Incandescent	750 to 2,000
Halogen incandescent	3,000 to 4,000
Compact fluorescent (CFL)	8,000 to 10,000
Metal halide	7,500 to 20,000
Linear fluorescent	15,000 to 20,000
High power white LED	35,000 to >50,000

3.10 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.

3.11 Common use of LED parameters: Luminous Flux, Luminous intensity, Luminance,Illuminance, Color temperature,Light Effect,Color rendering

Luminous Flux
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
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
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.

Illuminance
illuminance 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 Effect
Light Effect is the rate of the electronic power turning into the light power, It is unit as ¡° lm/W ¡±.

Color temperature
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
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.

3.12 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 efficacy. The efficacy of LEDs exceeds traditional types of lamps. For a rough comparison, the range of luminous efficacies for traditional and LED sources, including ballast and driver losses as applicable, are shown as follows.

Light Source	Typical Luminous Efficacy Range (Lm/W)
Incandescent (no ballast)	10-18
Halogen (no ballast)	15-20
Compact fluorescent (CFL) (incl. ballast)	35-60
Linear fluorescent (incl. ballast)	50-100
Metal halide (incl. ballast)	50-90
Cool white LED 5000K (incl. driver)	80-100
Warm white LED 3300K (incl. driver)	75-95