Wow - that looks really good. One general point, plants utilise the energy in sunlight to power photosynthesis but we just use it to see. Because our eyes open in dull conditions humans aren't very good at measuring light levels.
Point is, you need more lights than you might think to duplicate daylight.
I'd guess you have it right because your plants are reacting well. Just a word of warning, show growers nearly always use arttificial lighting in greenhouses to bring things along earlier than nature would like. These silver foil covered, brightly lit greenhouses seem to attract both moths and policemen