anything you need to google is fine to ask but nice that you also take it upon yourself a times of need...ya know
but no worries ask away most questions will be answered by somebody pretty fast
Smart pots??well .....smarter pot
even a couple smaller cfl screw in lights on a painter reflector socket will be fine for the tiny seedling stages
I have started seeds under everything from a tiny cfl to 1000 watter ,led and induction)just depends on the distance till they can take it for most
but any full spectrum lighting will give you a good vegetative growth
if you grab up a quick cfl at the local hardware go for natural daylight bulbs (if your cheap like me and the prices are huge dif between them when browsing you can by a Y socket splitter and warm white/cool white 1/1 ratios to make a sorta daylight balanced spectrum for a cheaper price at times
but the daylight or natural light spectrum will have a balance of cool white warm white in the bulb
warm white redder oranger end of spectrum
cool white bluer whiter look but other end of spectrum for growth
in you r size cabinet yeah I would go towards led/ if you have the start up cash
you could do cfl fairly cheap
you could do hid but heat WILL be an issue w/o real good air flow
in a case like this I would run a totally separate intake for fresh air on top also just to move the light heat away
but it isn't the case here
I have shown where I ran a 1000 watter in a 2.5'x 3' (but you better already know how to do it

)
SO ... leds
you looked around a some products?
not to get toooo personal but are you state side or the world abroad?
anything else shoot away.....