The actual meter reading is at the top center of the CC. This value is obtained by taking a meter reading from the subjects position. The f/- scale on the side does not correlate directly to the blue bar, but to the yellow dash. As you go from one light to the next, metering individually, these yellow bars mark where other lights were metered at, so you can keep track of which light metered what. It is entirely possible, even likely, that a meter reading from a B400 will yeild a yellow bar above the blue bar. As you power down the light, the yellow bar should track with the lowering blue bar.
The blue bars will be offset based on the model of light. for example, a B1600 would have a max blue bar just shy of the f/22 mark, a B800 would be just shy of the f/16 mark, and the B400 would max out just shy of the f/8 mark. All bars would be the same length, as that represents the range of power (5 stops on each light). An Einstein would top out the same as a B1600, but bottom out below a B400, as it has a broader range, but the same max power as a B1600.
Be sure when you meter, you are at the subject's position. You cannot dial in "f/4" and have the light go to an f/4 setting, without at least one meter reading for that light from the subject. Once you meter, and get f/16 (for example), you can then power down to f/4 without having to remeter.
I hope this makes sense.
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