Lamina RBG LED
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Lamina Ceramics RGB LED


The newest series of high-power LEDs from Lamina Ceramics, Series BL-4000, is single cavity design that comes in white or Red-Green-Blue (RGB). We are discussing only the RBG version. The photo shows the LED assembly. You can actually see six small LED chips in the center. The design uses two chips each in the colors red, green and blue.

 

Lamina Ceramics RGB LED


The waver is about the size of a Nickel and is intended to be glued or clamped to a heatsink. The electrical connections are made to the three pairs of solder pads visible at the perimeter.

The semiconductors used for each color are different materials and have different electrical characteristcs.


The table below shows the typical electrical characteristics for each channel.
 

 

Red

Green

Blue

Total

 

Voltage (V)

4.5

6.7

7.6

 

Current (mA)

350

350

350

1050

 

Power (W)

1.6

2.4

2.7

6.7

 

Thermal resistance for each color: 3.1 C/W


LED junctions are diodes and have a nonlinear resistance. The electrical feed has to be current-regulated. The different voltages for each color present some design challenges when multiple LEDs are used for the complete light fixture.

The fixture discussed here uses 8 LEDs. Therefore, if all LEDs were connected in series, the total voltage would range from 36 to 60.8 Volts. More on that later.

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