Oil pressure light coming on at idle

TrailBeast said
This is my reasoning on it.
Lets say the oil pump puts out 5 gallons a min max.
But worn bearings allow a 6 gallon per min flow.
I don't understand how a tighter spring is going to make the oil pressure compensate for a 6 gallon loss through the bearings if the oil pump can only do 5 gal a min anyway.
I always thought the spring was to relieve to high of a pressure and had zero effect at Idle RPM's unless cold oil was just to thick to pump through the bearings at 5 gallons per min.

See why it doesn't make sense to me?

What you and I think is correct. The pressure relief valve only governs the high end of the pressure, not the low end. This assumes that the valve is not stuck open and the return spring is present and not broken. The pressure relief valve doesn't even move until the RPM's are about 1500 when the enging is at operating temp. Naturally, when the oil is cold or if it's a real thick oil that figure will be a lot lower. With a stiffer spring, it just holds the valve closed until a higher RPM is reached.