Oil pressure light coming on at idle

RustyRatRod said

Well if that's the case, why is it you have more oil pressure all the way across the spectrum with a high pressure pump?

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I would think that the high pressure pump has a larger pumping volume and also a higher pressure regulator spring.

I could see a tighter spring making an oil pressure light go off at hot idle if the regulator valve was regulating pressure from idle to full rev, but I have always been under the impression that the regulator valve really only moved when the RPM's got high enough or the oil cold and thick enough where the bearings couldn't bleed off the full pump volume.