Usually all car turn signal lamps are around 12 to 20 watt rated which can be traditionally incandescent bulb types and generate more affordable light intensities in comparison to LED lights. Here we find out how these lamps could be restored with high effectiveness, high strength car LED bulbs.
The image below demonstrates what might be a car LED lamp instantly replaceable over the current holder.
It demonstrates a good appearing arrangement of flat, tiny SMD LEds in a circular pattern for allowing optimal distribution of light via the encased hind reflector.
The LED utilized listed here are the 3020 SMD LEDs, these types of tiny light emitting diodes are very much like the regular 5mm LEDs with their specifications, in spite of this if we compare their light intensities, the witnessed improvement seems to be huge, where the 3020 very easily wins by an outstanding margin, that’s why these LEDs are much desired instead of the ordinary 5mm LEds these days.
The technical features of the 3020 LEDs are:
Forward voltage: 3 to 3.2V
Forward current: 30mA optimal
Luminous Efficiency: 100-110lm/w
In the above image, we are able to refer to the LEDs constructed over pcs of PCB strips, tiled in a specific measured manner.
The vertical PCBs are 7 in numbers, and have 4 LEDs on each strips.
One circular PCB comprise of 22 LEDs may be seen placed over the vertical PCB structure.
The vertical PCBs thus incorporate 7 x 4 = 28 nos of 3020 LEDs, while the circular PCB mount 22 nos of LEds, giving a total of 28 + 22 = 50 LEDs
These 50 LEDs are linked to form 12 strings of 4 LEDs each, and a single string of 2 LEds.
Each of the 12 strings need to have their own individual series resistor (SMD) whose value could possibly be around 55 ohms 1/4 watt.
The single 2 LED string must connect a separate 250 ohm, 1/4 watt resistor.
These resistors act like current limiters for preserving the LEds from car alternator voltage fluctuations as well as help with keeping the illumination level across all the LED groups as even as possible.
The resistors can be employed at the rear side of the PCB strips.
The circuit diagram for the offered simple car LED lamp is demonstrated below:
Car LED bulb circuit making use of 3020 SMD LEDs and current decreasing resistors