With the arrival of the first year of LED general lighting market, LED lighting and the overall lighting ratio will exceed 10%. LED appear due to high pressure, most LED chip suppliers out of a danger, the production of low-voltage LED chips will be increasingly difficult to sell into the LED street lighting market. Will dominate the future of LED street lighting market.
High-voltage LED lamps can bring LED lighting to reduce cost and weight, but more important is to significantly reduce the design requirements of the cooling system, which will effectively cleared the LED lighting into the interior lighting market, the biggest technical obstacles. Compared to the low-pressure high-voltage LED There are two distinct competitive advantage.
First, in the same output power, high voltage LED drive current is much lower than the required low voltage LED. As to the high-voltage blue chip photoelectric 1WLED for example, the forward voltage drop of up to 50V, ie it can only 20mA drive current 1W output power, while the average forward voltage drop of 3V 1WLED, need 350mA drive current to 1W output power, so the same power output high voltage LED power dissipation during operation is much lower than low-voltage LED, which means that the cost of cooling aluminum housing can be greatly reduced.
Second, the high pressure can significantly reduce LED AC-DC conversion efficiency losses. To 10W output power, for example, if the forward voltage drop of 1W LED high voltage, the output of 50V can take 2 and 4 string configurations, four series LED’s forward voltage drop is 200V, that is to say just from the city 220V AC power (AC) utilizing 20V bridge rectifier and drop it. But if we take the forward voltage drop is 1W LED 3V low pressure, even 10, but also strung together the forward voltage drop 30V, that is to say the need to step-down from 220VAC mains 30VDC. The lower the differential input and output, AC-to-DC conversion efficiency is higher, such as high-pressure visible LED, transformer efficiency can be greatly improved, thereby significantly reducing the power loss of AC-DC conversion, the heat consumption reduce heat dissipation can be further reduced housing costs.
Thus, as the use of high-voltage LED to develop LED general lighting products, the overall power consumption can be greatly reduced, thereby significantly reducing heat dissipation shell design requirements, available thinner and lighter aluminum shell can meet the cooling needs of LED lamps, since heat aluminum housing costs are the main cost of LED lighting one of the components, aluminum shell effectively reduce the cost of effective means to reduce the overall cost of LED lighting.