Since when? Most of the people I know running vert run bare-bulb. Natural convection takes care of the heat.
Most vert growers I'd say run open air bare-bulb.
Have you ever seen any of the massive ops that go down in Canada? Shit tons of them run vertical bare-bulb... for a reason. If plants numbers are limited what so ever.. vertical is the obvious choice if there are no wattage restrictions. On top of all of the pros already obvious with vertical lighting, reflectors wear out physically. They wear out rather quickly. Just one more thing to replace.
That said.. I like to run both. Nothing really can compete yield wise to my vertical bare-bulb trees tic tac toe style. Donuts out yield my horizontal time and time again, but do require a bit more work I'd say.. (at least in my tight spaces I've worked).
Horizontal definitely has it's place. I love the simplicity of tossing some plants on a table, trellising it, and calling it practically done.
I don't think it's fair to have to choose. Hang more lights is my suggestion.
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Good post.
The HA basically invented vert bare bulb growing I think... most large ops in BC are indeed vertical bare bulb.