Here's my trekking setup. 6 leds in front with 2 red leds in the back in parallel. gen2 xpg and xpe, all in series. xpg has a 3 5.5v 1uf supercap for standlight. super cap and circuit is in the steerer tube.
The led optic holder is different in colour because I didn't have any spare left so I bought one locally instead of buying one online and waiting a week.
Road dynamo taillight is currently a b&m, not bright enough, will be replaced with a single cree xp-e.
Single cree xp-e red on my townie.
Sometimes I run this with a 100 lumen red led flashlight in flashing mode, but most of the time, this is plenty. Way better than battery powered 2w taillights.