Smell could be minimal or extremely stinky. Usually determined by genetics primarily, then secondly by environment variables, from how warm your room is, how well you ventilate, whether your room is sealed well or not, how healthy the plant is, how far along into flowering.....etc. Lots of factors on top of genetics.
As far as the lights, I have never tried LED's or CFL or anything other than flourescents or MH for veg, and HPS for flowering.
I did at one time, use HPS dual spectrum bulbs. They used an HPS ballast, and could be used thru the entire grow (except for initial clone rooting phase).....and worked friggin awesome.
As far as reducing smell, I will point you to carbon filters as the first and best choice. Whether you go guerilla style or commercial style is up to you. Meaning, there are ways to make cheap but highly effective carbon filter/scrubber systems, or you can fork out the money and purchase pre-builts.....this is what I have done in the past, but this thread shows you how to do it for next to nothing.
https://www.rollitup.org/indoor-growing/90893-ultimate-odour-control-thread.html
A room running negative pressure with a carbon filter can be virtually "stenchless", even IN the room if you build an internal srubber style filter. If you double up, meaning internal scrubber with a filter on your exhaust as well, and run a "negative pressure", you could grow under everyone's noses without them having a clue.