Although the LM317 is rated for 1,5 Ampere, I wouldn't recommend it for applications that need more than 1 Amperes, because it gets very, VERY hot. The closest E12 value is 1,8 ohms, the output will be 694mA the resistor must be at least 1W in both calculations. If you use 3W LEDs, which has a current consumption of 700mA, the calculation should be: 1,25 divided by 0,7 makes 1,78. However you can't see any difference in the light output. The closest E12 value is 3,9 ohms, it will give you a constant current of 321mA. So if the resistor is 3,57, constant current will be 350mA. Because LEDs require DC power but are often used in AC-powered environments, LED drivers may also be used to convert AC current to DC. Enclosed or Caged 35350W - Mean Well LRS Series. Desktop 1890W - Mean Well GST Series 120W - Phihong 12V Output. Wall Mount 12W - Phihong 12V Output 24W - Phihong 12V Output 36W - Mean Well 12V Output. so if you want to connect one or more luxeon 1W LEDs, which has a power consumption of 350mA, the calculation should look like this: 1,25 (the constant reference voltage of the LM317) divided by 0,350 (the LEDs power consumption) makes 3,57. LED drivers power supplies that are similar to the ballasts used for fluorescent lighting systems, in that they provide power to your lights and keep them regulated properly. Power supplies allow you to power your LED and driver from a wall outlet or other source. Ohm's law says that U/I=R, which means that Voltage divided by Ampere makes resistance. The LM317 regulator gives out a constant voltage of 1,25 volts between ADJ and Vout, so by adding a resistor between these two outputs, you'll get a constant current.
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