how many watts of HID?

Hey everybody, so i am an amateur grower and i currently have two very small sproutlings under a 27 watt florescent bulb (which i know is not NEARLY enough but they are still very little so i am not too worried) and i was going to get some HID (metal halide) bulbs and i wanted to know how many watts you would recommend for two small plants. If anyone knows anything that would help me it would be much apreciated.
 
Hey everybody, so i am an amateur grower and i currently have two very small sproutlings under a 27 watt florescent bulb (which i know is not NEARLY enough but they are still very little so i am not too worried) and i was going to get some HID (metal halide) bulbs and i wanted to know how many watts you would recommend for two small plants. If anyone knows anything that would help me it would be much apreciated.

This chart should help
 

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