how to convert 4V (voltage) to light intensity (lux)?

Question

mrnood · Answer

these two units do not represent the same 'type' of phenomenon, therefore oyu cannot 'convert' between them

You can convert feet to kilometres because they both represent length
You can convert electronvolts to Joules because they both represent energy
You can convert pounds to milligrams because they both represent mass

In technical terms - these have the same 'dimensions'

Volts and Lux have different dimensions so you cannot convert one to the other.

If you have an experiment set up you may find that for a given voltage applied to a lightsource that the lux output depends on the voltage, and you can establish a relationship. This will be specific to a particular experiment so you cannot make a general 'conversion'.