is it true that Williams games from the 80s (black knight etc) need no midifications or extra boards to work with LEDs?
Do some games need modification?
Yeah for example Bally Solid state games like Kiss Playboy evil kinevil etc can’t run LEDs without a replacement lamp board
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Do you know the reason why they need more load?
It is more to do with the fact that technology is different. Lamp Driver boards were designed to run incandescent globes. They are not compatible with LEDs, as LEDs are different technology, and less current draw. Globes can dim with different voltages, whereas LEDs need to be on or off.