Measure the solar street light LED light output efficiency

Now buy solar street lamps customer demand for products is more and more high, not only in the light of time requirements, but also for the LED light output efficiency requirements. Solar street lamps lighting at night is how brightness, user's first impression of how light efficiency. For

now buy solar street lamps customer the demand is higher and higher, not only in the light of time requirements, but also for the LED light output efficiency requirements. Solar street lamps lighting at night is how brightness, user's first impression of how light efficiency. For solar street lamps factory, and can do a light output at the factory test report. Solar street light controller will now LED constant current source integrated together, more convenient user set power output according to the demand of light output. In order to play can achieve energy saving purpose and lighting effect, LED lamp manufacturers need to strictly according to user requirements to make corresponding countermeasures. If necessary you can leave a test report.

measurement of LED light output there are some special need to pay attention to the point, in terms of light capture, 6 points in the ball can meet the demand. As long as the sensitivity is sufficient to ensure measurement precision of the single star LED light output, integrating sphere can also use a few bigger.

LED their fever thornier, fever will cause the flux decline until thermal equilibrium state is reached. Even if the LED is installed on the large heat sink, junction temperature will rise in measuring instantaneous 10 - 20 ℃, which leads to the luminous flux measurement results of a few percentage points compared with measured at room temperature. LED manufacturer with 25 ms current pulse drive leds, to ensure the junction temperature kept at room temperature. Unless the use of special equipment, it is impossible to get the same luminous flux measurement results with the data in the table.