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LED and Bulb Ratings in Illuminated Devices

The 24V or 48V LEDs would be used when the customer has a full voltage light units.  So, they apply 24V to the terminals of the light unit and 24V is then applied to the LED.

 

The resistor and transformer light units are special.  Transformer light units all have 6V Secondaries, regardless of primary voltage.  The resistor light units uses a 120V bulb, but they use the resistor to drop the voltage to around 60V.  so, the 120V bulb sees 60V, it is almost just as bright but it lasts longer.  

 

Note : The resistor light units are only suitable for incandescent bulbs