Hi Folks: I am taking a close up of a deep yellow flower under uniform light. Spot metering the yellow petals of the flower indicated a shutter speed 350 for a certain F stop.

I metered a grey card next to the flower under the same light and took a reading - shutter speed: 500 ( same F stop )

What settings should I use to get a better exposure of the yellow flower ? 350 ( reading from the flower ) or 500 ( reading from the grey card )

Thanks Allen