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What is the difference between transformer and full voltage in the 9001KM light modules?

Difference between transformer type and full voltage type light modules.

Product Line:
Harmony Push Buttons

Harmony 30mm

All transformer light modules have a secondary of 6 volts, so they all use 6 volt lamps, no matter what the primary. With full voltage you must use a bulb of the same voltage as the input voltage.

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