i have tried a good few lamps now, an the best by a country mile are the lighforce, either the striker or blitz depending on the size a the fields ye will run, i know they pricey but once ye got them an had a tinker to make them fault proof, they realy do take some beating, so rather than waste money on cheaper lamps, id buy 1 a them 1st, battery depends on yous, i liek the lithium uns, nice an light as i lamp on foot, bunnys soon get used to a lamp after seeing 1, so its best to catch them before they know what 1 is lol, filter do work, but they aint some magic thing you put on lamp an bunnys