Ngineering has created three Assortment Packs of resistors for hobbyists that are planning various different projects or want to experiment with variations in LED output intensity. Each pack is an assortment of different resistor values selected as the best general grouping for our LEDs when used with a specific supply voltage. The NX9V is intended for use with a 9-volt DC power source, the NX12V with a 12-volt source, and the NX18V with an 18-volt source. Below is a detailed listing for each pack.