Troffers usually require a deeper recess for installation while panels are thinner and require less space for installation.
Learn more about Troffers here!LED troffers and LED retrofit kits are not the same, but they can both replace previous lighting fixtures. LED troffers are cost-effective alternatives to traditional fluorescent fixtures. They are designed for drop ceilings in commercial and institutional applications such as offices, schools, hospitality, healthcare, and other commercial and industrial applications. On the other hand, LED high bay retrofit kits are LED fixtures that feature common lamp bases to allow you to keep your existing high bay fixtures while replacing the metal halide or HPS bulbs with a high powered LED luminaire.
Not only are retrofit kits more cost-effective, but they provide an easy way to update outdated lighting fixtures. They are energy efficient alternatives to incandescent bulbs or metal halide bulbs. They feature long life spans and high lumen output with low energy consumption.
LED is the way to go, it just depends on which area you are trying to light. For commercial uses, go with LED troffers. If you want to upgrade high bay light fixtures in places like warehouses choose an LED retrofit kit.