Earlier in the week I was caught out while riding with a weak front light, and ended up riding through flood water because I thought it was just a little puddle 
So I ordered a cheapo 7w cree torch off eBay for 9 quid...
Just been out for a test ride and it was awesome! On dimly-lit roads I could see as well as in daylight. That wasn't enough of a challenge so I went to the local park and rode through absolute darkness, and again I could see the path perfectly, and there's enough of a spread on the beam to get some peripheral lighting too. It runs off 3 AAA batteries, so there's no faffing about with getting 18650s and a special charger.
If you're thinking of getting new lights now the nights are drawing in, these seem well worth a try.

So I ordered a cheapo 7w cree torch off eBay for 9 quid...
Just been out for a test ride and it was awesome! On dimly-lit roads I could see as well as in daylight. That wasn't enough of a challenge so I went to the local park and rode through absolute darkness, and again I could see the path perfectly, and there's enough of a spread on the beam to get some peripheral lighting too. It runs off 3 AAA batteries, so there's no faffing about with getting 18650s and a special charger.
If you're thinking of getting new lights now the nights are drawing in, these seem well worth a try.