I've yet to do a nightrun but I've just bought one of these in preparation.
https://www.alpkit.com/products/gamma-3
It's retina destroyingly bright on full power with an excellent penetration and spread of light, and, at £19, a bargain. It looks and feels very well made.
Hoping to get out for a run tomorrow morning with a canicross friend. She's bringing all three of her dogs down with her and we'll run with two dogs each on split running leads. She's fostering a rescued lurcher at the moment so I may have him to run with Mabel, my lurcher.