Tent lighting

200w. Think of it like candle power. 1 candle casts light, 2 candles casts twice the light. 100 candles can light an entire room. etc.. Candle power is the light output of 1 candle cast over 1 square foot of space. The more candles in that SQ, the more intense the light.

The lights are really only half the equation, you're light footprint matters too. In your question if the two lights are covering the same footprint, then yes it's effectvely 200w-ish but if you spread those 2 100w lights out far enough then it's still only 100w or someplace in-between actually getting to any individual plant.

200 watts, 100 under each board...for a total of two hundred

Those who have 10000W setups, You think have them in one unit or multiple ? Someone needs to go back to school ;)) Or i didn't get the question ;)))