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For
example, assume that one side of the HID high-pressure gas discharge
light source, the luminous efficiency of 100 lm / w, but because light
emitted light in free space in the uniform radiation (Lambertian
radiance), so the optical system efficiency of a light only 40%, so
that the full system, its electro-optical conversion efficiency is
about 40 lm / w. But if the other side of the use of LED light source,
the luminous efficiency of 50 lm / w, due to the direction of outgoing
light to focus, so the efficiency of optical system a better light is
assumed to be 80%, then the overall system of electro-optical
conversion efficiency is 40 lm / w, as shown in Figure 5. The above
example, the main re-emphasis LED directional light source and the
lamp, and in some ways, you can enhance the efficiency of use, so it
might luminous efficiency, and some other light source still a gap
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