Which fixture uses a lens with engraved concentric circles?

Which fixture uses a lens with engraved concentric circles?

• A. Fresnel
• B. PAR
• C. LEKO
• D. LED Panel

Answer: (A)

The light-shaping element here is the Fresnel lens design. The engraved concentric circles are grooves cut into the lens so it can bend light effectively while staying thin and light. That stepped, ringed surface creates a soft-edged beam with adjustable focus simply by changing the distance between the lamp and the lens. In stage lighting, this combination gives a warm, wash-like spread that can be sharpened or softened as needed. Other fixtures use different optics: a reflector-based unit like the PAR has no grooved lens, an ellipsoidal (LEKO) uses a different, more precise lens arrangement for sharper edges, and an LED panel relies on diffusers and LED arrays rather than a single grooved Fresnel lens. So the lens with engraved concentric circles is characteristic of a Fresnel.

The light-shaping element here is the Fresnel lens design. The engraved concentric circles are grooves cut into the lens so it can bend light effectively while staying thin and light. That stepped, ringed surface creates a soft-edged beam with adjustable focus simply by changing the distance between the lamp and the lens. In stage lighting, this combination gives a warm, wash-like spread that can be sharpened or softened as needed. Other fixtures use different optics: a reflector-based unit like the PAR has no grooved lens, an ellipsoidal (LEKO) uses a different, more precise lens arrangement for sharper edges, and an LED panel relies on diffusers and LED arrays rather than a single grooved Fresnel lens. So the lens with engraved concentric circles is characteristic of a Fresnel.