An LED's plastic body does not determine its color; instead, its color is determined by the semiconductor material used to construct it. Thus, some LEDs may come with translucent or milky bodies and their colors will not be discernible until they are lit.
Video Product Inc's LED Tester provides a quick and easy solution to checking the color, relative brightness, uniformity and functionality of any LEDs.
- VPI's LED Tester (Part #: TESTER-LED)
- LED lights
- 9V battery
Power up the LED tester by inserting the 9V battery into the back of the unit. Replace the cover and hit the “Test” button on the right. The green LED labeled “Batt” on the left side should light up, indicating that the battery works. If it does not light up, try substituting it with a known good battery.
The LED tester provides a range of currents to test the LEDs in: 2 mA, 5 mA, 10 mA, 20 mA, 30 mA, and 50 mA. The 10 mA current has seven available slots while the rest have one each. The brightness of an LED is proportional to the amount of direct current that flows through the LED. Hence, the more current flowing through the LED, the brighter it will be. The LED tester can be used to determine the optimal current that passes through the LEDs for a desired brightness level in an installation.