Battery Adapter for Gossen Luna-Six / Luna-Pro
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A battery adapter with built in diode. Designed to use with 1 x 2L76 or 2 x 357/SR44 batteries.
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DESIGN
This adapter allows an original, unmodified Gossen Luna-Six and Luna-Pro exposure meter to operate from modern batteries.
These meters were originally designed to use two 1.35 V mercury cells (MR-9/PX625 type). Since mercury batteries are no longer manufactured, modern replacements typically have a higher operating voltage than the meter was designed for.
This adapter uses a silicon diode to reduce the voltage of either:
one 2L76 (CR-1/3N) 3 V lithium battery (recommended), or
two 357 (SR44) 1.55 V silver oxide batteries,
bringing the supply voltage closer to that of the original mercury cells.
There has been considerable discussion regarding the “ideal” diode for this application. While Schottky diodes are frequently recommended, I found the inexpensive and widely available 1N914 and 1N4148 to produce satisfactory results in several original, unmodified Luna-Six/Luna-Pro meters.
As with any vintage exposure meter, individual meters may vary slightly due to age and previous calibration. If maximum accuracy is required, compare the meter against a known reference after installation.
ASSEMBLY
Parts required
Printed adapter
1 × 1N914 or 1N4148 diode
1 × 2L76 (PX27A) lithium battery (recommended) or 2 × 357/SR44 silver oxide batteries
Flush cutters
Assembly
Locate the small 0.5 mm hole in the side of the adapter. If necessary, carefully clear the hole with a sewing needle or similar tool.
Identify the banded (cathode) end of the diode. Bend this lead and insert it through the small hole into the diode pocket. Trim the excess lead flush with the outside of the adapter.
Bend the remaining lead into the molded channel around the side of the adapter, then continue bending it around the base of the adapter as shown in the photos.
Install the battery (or batteries), insert the completed adapter into the meter, and replace the battery cover.
Perform the meter’s battery check and verify operation against a known light source or reference meter.
Notes
This adapter is intended for original, unmodified Gossen Luna-Six and Luna-Pro meters.
The design is completely different from the Gossen V207A battery adapter and is not interchangeable with it.
Feedback, measurements, and improvements are always welcome.