Want to add LED aux. driving lights

Change the H11 halogen low beam bulbs to LED bulbs. That is the easiest solution.

Search this forum for LED bulb recommendations.

 

I went with a light bar from Prius Offroad that bolts to the towhook mounts, and four 50w KC Slimlite LED lights.
Two switches used: one for outside mounted amber covered lights, one for inside mounted white lights. These switches were from a Sequoia and mounted to the blanks to the left of the steering column. Only drawback is switches illuminate amber instead of green.

Edit: I had to replace my headlight housings as the interior reflector surface was oxidizing causing light to diffuse everywhere and made seeing at night difficult; just this alone improved the light 1000% and were purchased on Amazon. I didn't like the aftermarket LED bulb patterns so am using Sylvania Silverstar zXe halogen bulbs which work great.

 

I had a 2012 Prius C and swapped out to 6000K LEDs; they worked great. Check your plastic lens for fog and chips - they really scatter the projection lamps. Get them polished out to restore the beams sharpness.
If you still want to add aux. lamps, I'd recommend using 3000K LED bulbs. The ones with the large heat sinks. They really light up the road and cut through the fog.
I converted my SUV to HIDs over a decade ago. It's my camping/fishing rig, so it doesn't get used as often as I like. Those HID ballast resistors kept burning up. They were the cheap ones and OEM's didn't have that problem, but they were really pricey - even the junkyard ones. So it was more cost effective to move to LEDs, haven't looked back since. Same bright lights, lower current draw and best of all no delays in ignition. I still have the HIDs installed in the fog lamp position, I didn't have a problem with those and used them when one or both HID lamps died on the trail. I've helped a lot of my friends replace their halogens with LEDs, when they saw how well it lit up the trail. Almost as good as those bar lamps some of them had mounted on their trucks.

PS, some state regulations require off-road lamps to be covered on pavement.