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Is it open space above the joists or is there sheathing/sub floor? Depending, I’d find it far more aggravating and time consuming installing wood hangers (even 2x4) between the joists. Each piece would need to measured pretty accurately for good fit. No way would I bother with 1x4 in the method you’re suggesting. Not because it wouldn’t hold, just the pain in the A$$ install work.
Since you’re saying you want to run the lights parallel with the joists and up into the space between the joists with nothing proud of the joist bottoms, I’d do lightweight chain IF there’s sheathing on top of the joists to screw into.
If nothing above the joists and your lighting layout has multiple fixtures lined up side by side, you could also drill perpendicular through the joists in-line and run heavy galv wire from one side completely through to the other which would create hangers like the 1x4s in your mind. Then hang the lights from the wire using S hooks.
I’d also use MC cable directly into the lights and not use boxes.
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Harmlessly passing gas in the grassland away;
Only dimly aware of a certain smell in the air
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