Here the MR355 is being used to simulat welding within a factory building. Ensure you have the dropping resistor on the Positive feed to the relay common terminal. The Mini toggle switch should be placed on or near your control panel for ease of operation. Set the Presets as desired to give the best effect for you. As these are bright LED’s they should be placed inside a building away from any windows to give the best effect.
As the diagram shows VR2 is to control the white light and VR1 controls the Blue light, movement of the presets is very small to give a big change in the ON time.