2.5mm garden lighting wire is good quality and works well without any power loss.
Worked well for the job required
I have used a number of brands of wire for garden lighting. The Havit 12v copper garden cable seems to be the best for quality and ease of use.
Good heavy duty cable, well insulated.
Purchased 40m of this to install 12v wall lights and it's strong, durable and easy to work with.