I second the phone call to peak - they can do you a red output in many levels to suit your needs - I'm sure they can match the CMG low you have or lower. In AA or AAA format.
The red low I use is an old ARC AAA red, but they don't make them any more.
I would also recommend the Gerber Recon. Four low outputs ( well one white led and three other twist to select filters for RGB ) and one AA battery. A bit more bulky than the others but very versatile.
Also if you google Astronomy Flashlight, you will see many torches made for low light situations - Orion, Celestron and Rigel all make flashlights with variable level low light red outputs - some also have white and green as options.
Good luck.