I have small project where I used a power supply supplying 15Vdc wired to LM318T to output 5.1Vdc. I am trying to drive a load of 21 LEDs. Each LED is wired in parallel with 100 ohm resistor. I was trying to "turn on" the load with a transistor hook up with a photo-resistor so it turns the LEDs on at night. By my calculations: 3.2V with 100 ohm resistance = 19mA = ~20mA. Load total = 20mA x 21 = 420mA. P = 3.2V x 0.420A = ~1.3W. The transistor is 1300d. I hooked up 100 ohm resistor to same 5.1V supply to the base of the transistor. The load is between the 5.1V supply to the collector. Emitter to ground. The LM318T begins fine but then begins to heat up rapidly. I do have the LM318T mounted to a heat sink. Is it suppose to get really hot? Did I miss calculate?