Learn your lesson and stay away from test lights that aren't clear. Red is difficult to see when testing wires that can be damaged by a small current load. You can have 6 volts on a wire on a strand. It will glow, but you'll have to put your nose to it to see it. In normal use, it will glow normally. I just can't recommend it. Visibility is everything. You cannot diagnose what you cannot see.
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