If there is oil on the dipstick at all, it is highly unlikely that your oil pressure light will come on, assuming everything else is normal. The full mark on your dipstick is where it should be after draining and refilling to spec. Should be 4.5 quarts or so on the 4cyl; not sure of the exact number on that. Some manufacturers will state that the car should sit for an arbitrary amount of time before the oil will actually hit the full mark, but I've never known Honda to be like that.
Bottom line is one quart low. Below that, there is absolutely no standard for graduation. If there is one inch between the 'full' and 'quart low' marks, you can't simply say that two inches will equal two quarts.
Beyond that, though, Hondas typically don't even have much below the quart low line. At 1.5 quarts low, the dipstick probably has no oil on it.
A quart low on an engine with a 4.5qt capacity should NOT cause an oil pressure light. Ever. Something is wrong, and it should concern you far more than what sounds like fairly minimal oil loss. Either that, or (no offense) you are not reading the stick correctly, and you are actually losing a ton of oil. I.e. you're getting an oil change, seeing an oil pressure light (let's call it the 'functional main/rod bearings are overrated' light) 3k later, and adding a quart of oil when you are actually, in fact, multiple quarts low.