Maybe you can consider the new Fireflies T1R. It has a new high efficiency driver and look like it will be quite compact, with bonus high power usb C charging.
Features from Prototype:
• Single Osram CULNM1.TG
• Max output 1000 lumens ;
• Light Intensity: 125 000cd , 700meters
• With RGB Auxiliary LEDs
• Battery type:
22430 / 18350 (short body)
21700 / 18650 (Long body)
• Built-in USB Type-C 2A fast charging
• High efficiency 6A Constant Current Buck driver ; Efficiency > 93%
• Made of 6063-T6 aluminum, Type III hard coat anodizing
• High efficient 3.6 Degree TRI Optics; Up to 138cd/LM
• Ultra Clear AR Coating Glass lens
• Stainless steel …