What is the test for reducing first degree murder to second degree murder?

"The test of whether provocation or heat of passion can negate malice so as to mitigate murder to voluntary manslaughter is objective. [Citations.] '[N]o defendant may set up his own standard of conduct and justify or excuse himself because in fact his passions were aroused, unless . . . the facts and circumstances were sufficient to arouse the passions of the ordinarily reasonable [person].' [Citation.] The test of whether provocation or heat of passion can negate deliberation and premeditation so as to reduce first degree murder to second degree murder, on the other hand, is subjective. [Citations.]" (People v. Padilla (2002) 103 Cal.App.4th 675, 678.)