CR123 EDC Lights - One Cell or Two?

[JAH 3rd]

My outdoor home flashlight is a Streamlight ProTac HL 4. It takes 4 123 batteries. This flashlight puts out around 2200 lumens on high output, which is what I use. It didn't take long to figure out I would go broke replacing the batteries. So I went with 18650 LI-ION rechargeable batteries. The light takes 2 of these batteries. I also bought 2 additional batteries that are charged and available when I need to put in fresh rechargeables. This works great for around the house. The 123 batteries have a great shelf-life and are a good option for backup if one is without power at home or elsewhere.

[TGS]

Put me in the camp that single CR123 cell lights are too short.

My current everyday light is the Streamlight Macrostream (not Microstream), which uses a single Streamlight 66321 battery. An 18650 light is doable and what I carried prior (Streamlight 2L-USB, I think it's called), but the Macrostream's length, diameter, and 2oz weight is just a touch more comfortable in a wider range of clothes.