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Figure 4 | BMC Plant Biology

Figure 4

From: Design and fabrication of adjustable red-green-blue LED light arrays for plant research

Figure 4

The circuitry powering the large LED banks. A) Two repeat units, driving two independent sets of 30 dies in Norlux HEX arrays. Q = TIP 170 PnP transistor; R1 = 22 ohm, 1 watt, metal film resistor (+/- 5%); R2 = 20 ohm, 1 watt, metal film resistor (+/- 5%); Rb = 4.7 k ohm, ½ watt, metal film resistor (+/- 5%). B) The assembly of the individual units into a controller for red, blue and green circuits in a 16 HEX array.

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