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1.WHAT IS LED (Light Emiting Diode)?
There are currently two ways to make lighting with LEDs. One method mixes multiple wavelengths of different LEDs to make light (i.e. RGB); allowing the lighting designer to tune the white light to a specific color temperature. The second method uses chemically a blue Indium-Gallium-Nitride (InGaN) LED with a phosphor coating to create white light. This is the method that results in the more commonly seen “white LED”.

2.What is the range of color temperature in WLED?
WLED covers the full spectrum from 2760K-10,000K (Kelvin). Generally, SOLi Solar Lithium Lighting offers three kinds of white light for our customer. They are warm-white(3000K-3500K), neutral-white(4000K-5500K) and cool-white(5500K-7500K).A special color temperature lighting can be made in regards to SOLi customer instruction.

3.What is the Color Rendering Index (CRI) of LED?
Color Rendering Index or CRI is the calculated rendered color of an LED light. The higher the CRI (based upon a 0-100 scale), the more natural the colors appear. Natural outdoor light has a CRI of 100. At current technology, CRI of LED is between 70 and 85 percent.

4.What are the advantages of LED?
Energy Efficiency at its apex with SOLi! LEDs are highly efficient. The best modern available white LEDs (as of 2014) produce about 130-150l/w in SOLi technology, compared to 14-17.5 lumens per watt for standard "A19" 220 volt 60 to 100 watt incandescents, and typically 16 to 21 for most halogen lamps rated to last 2,000 hours or more.
Luminous efficacy is an important indicator of energy efficiency, but it doesn’t tell the whole story, particularly with regard to directional light sources. Due to the directional structure of its light emission, LEDs potentially have higher application efficiency than other light sources in certain lighting applications. Fluorescent and old type “bulb” shaped incandescent lamps emit light in all directions. Much of the light produced by the lamp is lost within the fixture, reabsorbed by the lamp, or escapes from the fixture in a direction that is not useful for the intended application. For many fixture types, including recessed downlights, troffers, and under-cabinet fixtures, it is not uncommon for 40-50% of the total light output of the lamp(s) to be lost before it exits the fixture. LEDs emit light in a specific direction and angle, reducing the need for reflectors and diffusers that can trap light, so well-designed fixtures and systems using LEDs can potentially deliver light more efficiently and much more lighting angle flexibility to the intended location.

Long Life! Some LEDs are projected to produce a long service life of about 100,000 hours. The standard of market much goes through the products with 50000hours lifetime. For this reason LEDs are ideal for hard-to-reach/maintain fixtures such as road&street lighting and, combined with its durability, building, traffic signs and indoor lighting. This service life can be affected by the application and environmental factors, including heat, moisture and being overdriven by the power supply. Leds have to be driven within the current limits of its technical parameters.

Environmental Protection! LEDs are made from non-toxic materials. In contrast incandescent/flourescent lamps waste too much energy and produce toxic gases. and unlike neon as high-voltage requirements and easily damaged, which has been recognized as high-tech environmental protection products by global market. LEDs can also be recycled.

No UV Emissions/Little Infrared! LEDs produce no UV radiation and little heat, making them ideal for illuminating objects, such as works of art which are sensitive to UV light.

LEDs are Durable! LEDs are highly rugged and tough. They feature no filament that can be damaged due to shock and vibrations. They are subject to heat, however, and being overdriven by the power supply.

Small Size/Design Flexibility! A single LED is very small and produces little light overall. However, this weakness is actually its strength. LEDs can be combined in any shape to produce desired lumen packages as the design goals and economics permit. In addition, LEDs can be considered miniature light fixtures; distribution of light can be controlled by the LEDs’ epoxy lens, simplifying the construction of architectural fixtures designed to utilize LEDs. A controller can be connected to an LED fixture to selectively dim individual LEDs, resulting in the dynamic control of distribution, light output and color. Finally, DC power enables the unit to be easily adaptable to different power supplies.

Other Benefits
The other benefits of LEDs are:
·Lights instantly
·Can be easily dimmed
·Silent operation
·Low-voltage power supply (increased safety)

Light Comparison Table
The high efficiency SOLi LEDs can be used in a variety of applications. The most appropriate solution is dependent on the overall budget, needs and type of installation. Different light sources will be used in different applications based on the needs of the people.

Lamp Type Incandescent Compact Fluorescent WLED
Efficiency (Lumens/Watt) 5~18 30~79 130-150
Rated Life (Hours) 1,000 6,500~15,000 50,000 to~100,000
Durability Very fragile Very fragile Durable
Power consumption on %100 scale 100 30 10
CCT deg K 2,652 deg. 4,200 deg 5,000 deg
CRI 98 62 82
$after 50,000 Hours $200 $60 $20