Red spotlight or hand held

You don’t get ever close to 500 lumens with a single red XP-E2

I would go with a Sofirn C8F, you need a triple to get to 500 Lumens

Get a low drain protected battery like Panasonic 18650B this should get about 1.2A per emitter

3xXP-E2 Orange red should give you about 600 OTF Lumens then