Well I should have said hydro nutes, but since we're talking about hydro...well you know. Now I didn't really know there was a difference in hydro nutes as far as any being specifically for a passive system. I'll see what I can dig up as far as the Lucas formulaWell I'm just saying what Hempy (the inventor of this grow method) himself says peeps, and I get great results.
Hempy uses Canna Classic (aka Hydro aka Substra, depending on which country you live in), in a 10L bucket, and we all know how impressive his plants are.
I must admit I know jack shit about the lucas formula. All I know is that it's probably the most used nutes when it comes to ganja growing. If the lucas formula is for passive hydro, then yes you can use it in Hempy buckets.