12V DC & 24V DC LED lights LED Lights that can work off a Standard Car battery is an attractive proposition. We have created a few designs on 12V as well as 24V DC. It is important that LEDs are driven with a constant current. An LED is a current driven device. That is it will light up to its given intensity when the rated current flows through it. Its colour rendition will also be specified at that current. Anything above or below the rated current two things will happen. The intensity will change, as will be the efficacy i.e. lumens/watt The Colour temperature will shift and you may not get the white light that you expect. What is the role of voltage? Once you ensure a constant current (we will see how we can achieve that later), we can then measure the voltage across the terminals of the LED. This voltage should be in a range specified by the manufacturer. For White LEDs it is usually in the range of 2.9 to 3.5 Volts. Whatever the c...
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