two options to consider: ReyLight Pineapple Mini ($35, AAA size) and LANapple ($43, AA size), available in several colors of anodized aluminum.
both use the Nichia 519a R9080 4000K LED, which is high CRI and neutral/warm CCT, and come with a rechargeable lithium ion battery. (charger not included.*)
use the programming guide to configure the modes, which can include firefly/moonlight.
(* for a beginner charger, the Xtar Ant MC1 Plus + 2.1A USB Wall Adapter is decent, cheap and widely available.)
reviews: pineapple mini, lanapple