Backlit letters work well for upscale businesses like high-end restaurants, law firms, medical practices, boutiques, and spas. They communicate sophistication and attention to detail. There's a steakhouse in my area that uses backlit letters, and at night that subtle glow makes the place look elegant and expensive, which matches what they're selling. Frontlit letters would've made it look like a chain restaurant.

They also work when you want to stand out differently. Most businesses go frontlit because it's bright and visible. If you want to differentiate by being more refined rather than louder, backlit does that. You need a clean, well-maintained wall behind the letters though, because the halo reflects off that surface. If your wall is brick, stucco, or painted in good condition, you're fine. If it's dirty or damaged, you'll need to fix that first.

Highway locations are a problem for backlit letters. If you're on a busy road where people are driving fast, backlit letters don't have enough punch. The subtle glow gets lost and you need the brightness of frontlit letters to grab attention at speed. Budget is another consideration since backlit costs about 10-20% more than frontlit for the same size. If money's tight, frontlit gives you more visibility per dollar.

Some business types just don't match the aesthetic. A tire shop with elegant backlit letters looks odd, and so does a fast-food place or auto parts store. The sophisticated look doesn't match what customers expect from those businesses. And you can't mount backlit letters on a pylon sign or monument sign because they need a wall to create the halo effect.