converting sauna --8 bulb T5 HO --too much?

[dshallpost]

Just to follow up: I bought LED lights. Now I am wondering if there is some rule of thumb about translating from natural light to growing under lights. Thank you to Ray, who posted a while back explaining that the requirements posted for sunlight usually refer to peak light, and that you will not need those peak light level FC under 16-hour consistent artificial light. But how much less do you need? May be I will start a new thread . . . .