Which of the following is NOT an open-face lamp?

• A. Leko
• B. Fresnel
• C. PAR Can
• D. LED Panel

Answer: (A)

The idea being tested is whether a fixture uses built-in optics to shape the beam or simply relies on the lamp’s exposure and diffusion. A fixture that is open-face has no integrated front optic to define the beam; light exits through a relatively simple opening, often with a reflector and diffusion rather than a precise lens system.

A Leko (ellipsoidal reflector spotlight) uses a definite lens assembly at the front along with adjustable shutters, which means its beam is tightly controlled by internal optics. That built-in lens train makes it a closed-face, lens-based fixture, not an open-face one. The other options rely more on front-facing diffusion or simple reflectors rather than a dedicated front lens system, so they’re considered open-face in typical classifications. Therefore, the Leko is the lamp that is NOT open-face.