An aluminium bar with 8 high-power LEDs is on the basis . The bar is fixed by three screws with metallic header. The bar connects to the constant-voltage source 12V, the consumed power is 9W. The diffuser from transparent plastic is fixed over the bar with sticked semitransparent film. The picture shows the comparison of two playing machines: the left one is with original luminescent lamps and the right one is with LEDs. The cost of this solution is about 20 USD. The advantages are the even lighting, the better color rendering index , the less power consumption, the supply voltage 12V, there is no need to recycle and the lifetime without changing is more than 5 years. |