Not trying to argue or piss you off Mick...
When I did hydro (still do a few DWC buckets during the winter for fun/the hell of it) I tried the Lucas formula and was not impressed with the results.....I felt it did not allow the plant to get close enough to it's full potential......That's simply from years of growing and seeing just what some breeds potentials could be....
The Lucas formula works but I still say he'll get better results with the FloraNova series if used as directed and flip to the bloom at week 3 after the flip...
BUT, the real point is......Are you in soil or hydro?
Lucas is for hydro.....No way would I use it in soil!
Doc
Anyway,,,,the 2 you have chosen are very close in results.....Each works well and are worth using.......
Doc