The Graphic Rangelite uses 2 AA batteries that are installed in the Graphic Rangefinder/Rangelite housing on top of the camera body, not the flash synchronizer battery case.
The Kalart Focuspot works off the batteries in a 3-D cell flash synchronizer battery case.
I do not know which bulb has the highest light output at rated battery supply.
The Graphic Rangefinder/rangelite was only used on the 4x5 Pacemaker Crown and Speed Graphic.
The Graflite flash synchronizer came in two versions, the 2772 using 2-D cell batteries and the 2773 using 3-D cell batteries. Case extension 2774, 1-D cell, could be added in any quantity to achieve the 7 amps needed to fire all extension flash and trip the shutter solenoid.
Last edited by shutterfinger; 10-15-2013 at 02:19 AM. Click to view previous post history.