i would nt bother with the red filter mate they are a waste of money.the filter is not RED enough is more like pink.....
A red filter for a AA cell maglite works a treat, about £2.50 I think from maglite.com, trim with a file to fit and jobs a good en!
Its good for rats in a barn, but to be honest I didnt get on with it for lamping rabbits, ended up buying the tracer atom tactical instead, way more cash but cant fault it!!