The integral sphere is the most commonly used tool for testing LED products, but many of the points that are used by many factories are weak in testing low-voltage products.The reason for this is simple: there is an upper limit to the current supply of low-voltage lamps such as dc12/24/36v.With DC12V, take the 12w low voltage bulb for example, the integrating sphere should be 12v power supply output voltage, electric current achieve to A, some of the integrating sphere power supply 1 reach such a large current output.This is only can not12w ,there will be much more electric current about 3A like the DC12V 30w of flood light.Obviously, this is beyond the upper limit of many points.This is very frustrating for many factories. Is there any way to get the parameters of the low-voltage products we justuse existing integrating spheres? Yes,the current,There are, however, several alternatives.
1. Alternative method
High voltage power supply is used to replace low voltage power supply, which is very suitable for analyzing competitor's products.We know that the output current is always constant, whether it's a high voltage source or a low voltage source.So we just measure the power of the low-voltage light output current, and debug a high voltage power supply, make its output current with the same, so that we can use the existing integral sphere to measure optical parameters of the whole lamp,like CRI and Lumen and so on.With the basic optical parameters, as long as we use the power meter to test the whole electric parameters of the low-voltage lamp, all the basic photoelectric parameters are available.
2. converting method
This is a bit of a hassle, but it works well for low-voltage lamps which designed for ourself. Take example of DC12 12 LED bulb which designed by elegentlight,First, install the low voltage lamp we selected, install the high voltage power supply and lamp panel, and calculate the transmittance of the whole package with the existing integral sphere .And then we test the light flux that we've chosen to design the current, so that our entire optical parameters can be calculated.The great advantage of this method is that we can adjust our design according to the light transmittance and the led SMD parameters, so that we can get the effect we want.
But to ensure that the parameters we get are close to real, try to test as many sets as possible to reduce the error caused by the operation.
3. Integral sphere circuit substitution method.
This method is simple, but requires the operator to know the internal wiring of the ball.Integrating sphere method is to make the power box power supply cant connect the ball, random access a lamp on the outside, they can light up, and then use the other outside the sphere of power supply, dc power supply for integrating spheres so that we can get to test the same optical parameters.
The parameters tested are the most accurate and effective.
All the way above we can get the optical parameters of the light under using the existing integral of testing, in order to ensure accurate, at the same time,we can use several ways to check the same lamp body, also can use standard laboratory parameters to check and compare .
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