I mean, it's an interesting point but do keep in mind how much lower effort light bulbs are compared to a plant based diet. If you compare eating 1/8 less meat (like meatless Mondays) that's still probably harder than swapping to less shitty light bulbs.

Messaging should include both, although I'm with you that the focus is disproportionately on less efficient methods (especially plastic recycling, which is mostly a way to pass blame to consumers).