The Lucas Formula is generally a nute mix of 0 GH Floragrow-5ml Floramicro-10 ml Florabloom/per gal of water. This goes to 0-8-16 during flowering.
Forget about GH and Lucas. Get some Advanced nutes and never look back
right [/sarcasm]I have used both as well as a few of my friends our yeilds are nearly double with advanced.