In short, what are the options besides the somewhat spendy Glotoob Lithium? Must haves: - Single CR123A power - Wide-angle visibility - Not simultaneously larger than and more expensive than the Glotoob Lithium. One is ok, not both. - Keychain-style carry/attachment option (not clip-only) Would be nice to haves: - LiFeP04 compatibility - Varying intensity for different use cases - Small overall size - Durable, splash-resistant or better If the battery requirement seems odd, it's because I've chosen to consolidate everything on CR123s. I know there are a ton of safety beacons/flashers/etc. out there that use coin cells or AAA/AA cells, but I'm looking for CR123-based products. Thanks!