They will be fine for a 1sq ft space for up to around 2-3 weeks, at which point there will not be enough light penetration and the plants will stretch. So as long as your seedlings can fit in that well lit sq foot they will be fine, though obviously not as vigorous as a plant under more intense light.
Have a peek at the indoor subsection, cfl lighting. The 100w comparative value is not relevant to the situation as this is representative of how bright the light is perceived, not in fact being comparable to the wattage of HPS, MH or other HID lighting.
Have a peek at the indoor subsection, cfl lighting. The 100w comparative value is not relevant to the situation as this is representative of how bright the light is perceived, not in fact being comparable to the wattage of HPS, MH or other HID lighting.