HF LED Power Accessories

I’m not sure if this is the right place to ask this, (if not please direct me)
how far are we able to pushe the 5 volts from the transmitter for an LED implant. I realize it is most likely different depending on it being 13.56mhz or 125khz. but are we able to push from a wristwatch location to the webbing yet, about 10-15 cm? (@ either frequency)