Hey folks Need some help from yall. I bought some LEDs from ebay, and these will be used to show switch locations on my my layout. Im powering these from the AC terminals (since they are off the switch machines and snap relays) My transformer rates the AC at 18.5 V. These LEDs are rated on the listing 50 pcs 5mm Yellow LED 5000mcd & Free Resistor - eBay (item 140152612512 end time Mar-25-08 19:29:08 PDT) The site says they come with some resistors of different voltage, but everything is in DC. I need to know what kind of resistors to use for AC. Do these work for AC? Will the resistors listed work? I tried the resistor calculator, and it was all for DC. Any help? Thanks!