For Rainbow Lumi progression in Lumi Master, focus energy spending on event nodes that advance milestones offering free energy, Starlit Leaves, or coins. The supplied material does not identify specific nodes or give their energy-to-resource rates, so it cannot establish which stage has the best return.
The video description says the strategy connects energy spending to milestone claims, then uses free energy to continue progressing. Before spending, check which event nodes count toward those milestones and what each milestone rewards. Avoid assuming that a particular stage is most efficient without its costs and rewards to compare.

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30 players commented on this guide.
I wish I had read this before upgrading the wrong thing.
I tried this today and it worked better than my old setup.
The tips are practical and easy to follow.
Nice guide. I am checking the other HOT articles next.