Leakage current to ground

The general insulation standard for electrical equipment is an insulation resistance of not less than 1,000,000 ohms per kilovolt. This translates to a leakage current of not more than 1 milliamp. You do exceed the standard a bit for this surgical light. If you can separate them, measure the lamp and the power supply part separately to find out what the problem is. Generally, the wire is worn, insulation cracked, wire shells and other common failures, it is very simple to deal with.