How to maximize the efficiency of LED light

As we all know, the traditional incandescent lamp has such defects as high energy consumption, low efficiency. Based on energy conservation and environmental considerations, North America, Europe, Japan and Taiwan are gradually plan to stop the sale of incandescent light. LED bulb, owing to its high brightness, low power consumption, long life and environmental protection, etc., become the preferred alternative to traditional incandescent lamps. However, LED is a directional light source, it needs an effective light distribution pattern to achieve that it converses the small angle of the light into full light.

For the full range of lighting, the U.S. Energy Star made a strict definition, namely: light intensity should be gradual changed in the range of0o-135o vertical angle, the light intensity at any angle in this interval requires intensity value of 80% -120% in this interval average, and at least 5% of the total luminous flux should between 135o-180o. Specifically shown in Fig.

Hong Kong Applied Science and Technology Research Institute (hereinafter referred to as: ASTRI) LED lighting R & D team has successfully applied for the Hong Kong Government's Innovation and Technology Support. Programme，they will research and develop full light bulb type for a period of eleven months. In response to this issue, research team first conducted for existing products and technical research. Currently, many large international companies such as Philips, Osram, Panasonic, etc. have launched a 40W to 60W incandescent alternatives. Table 1 gives the major manufacturers 60W replacement bulb findings. In general, you want to replace 60W incandescent, LED's power needs at least more than 10W.

On the technical side, we generally use two methods to replace the traditional incandescent , one is the use of optical components such as lenses, mirrors, and diffuser, etc. to adjust the light-emitting pattern, thus producing a full range of light. Another one is through three-dimensional arrangement of the LED chip in all directions so that the light intensity is issued uniform. Here are a few typical design adopting two ways:

 

Patents CN101839410 (Figure b), the present inventors make use of multi-leaf with the reflection angle cooperate with the LED that has uniform distribution on a flat substrate for such reflection orthogonal projection of the page on the substrate to cover the plurality of LED light-emitting chips. Thus, part of the light emitted by the chip can be projected to the reflective surface of the leaf, and then be reflected to the surrounding space, and the other portion of the light can pass through the foliage of the gap, emitted from above.

 

CN102679219 (Figure III) describes a blister wrap the structure of the radiator. LED light-emitting components are placed on top of the radiator, and was a capable all-round light refraction as a light diffuser hooded. Based on reducing light loss considerations, the design of the outer section made of transparent glass bulb.

  

CN102486267 (Figure IV) uses a compound lens to achieve the beam divergence. This compound lens can be divided into three parts, one part is in the top of the central lens， LED light source can be part of the light emitted divergence. The second part of the wing-shaped lens, the light is partially reflected to the lower bulb periphery. The third part is the bottom of the lens may be the surface of the light reflective shine to the periphery of the upper bulb.

 

US20130027928 (Figure V), wherein the structure is formed by the two substrates. Wherein one substrate is placed horizontally, placed above a number of LED elements. Another piece of the substrate is an annular structure, and the first block is placed on the substrate at an angle. The outer annular substrate is placed in a number of LED elements measured. Thus, the first LED provide on one substrate of the light source direction, the second substrate to the edges of the LED as a light source. So as to achieve the purpose of full light.

These patents need strong R & D team and technology to achieve, Li Sida lighting learn these the most cutting-edge technology of  LED lighting, it has been making efforts to pursuit of maximum lighting efficiency and develop the most energy-efficient and environmentally friendly LED lighting，which is Li Sida lighting’s purposes, its indoor and outdoor lighting such as LED flood light, LED tunnel lights, LED tube have been exported to overseas, we have reason to believe that, Li Sida lighting www.lead-lighting . com will bring us more and better LED lighting thanks to its solid manufacturing and R & D team.