I used to use T10 four foot BL bulbs back in the day and they worked really well. IIRC Sylvania made them (when they were really made by Sylvania). Those Halco bulbs are re-badged and made by somebody - who knows. After spending way more time trying to find some for my new trip cave I settled on these from Amazon. I have 6 of them and I am very satisfied by their light output, color, and build quality. I would recommend them.
https://www.amazon.com/gp/product/B076PLKPKR/
Have fun!
EDIT: I also tested the power draw with my Killawatt meter and they average 17 watts each. Just a FYI if you're concerned your power bill might get a little high.