BH-A20 is KUPO Optics’ dual-finish “black-and-white” gobo material. One face carries a high-efficiency cold-mirror dielectric that sends nearly the entire visible spectrum forward while bleeding off near-IR heat; the reverse face remains matte-black for masking or intricate pattern cut-outs. Use it in ellipsoidal spots, projectors, scanners, or architectural fixtures whenever you need maximum image punch without cooking the gate.
At 45 ° AOI the curve climbs from under 10 % reflectance below roughly 325 nm to beyond 90 % by about 390 nm, rides a 92 – 94 % plateau through ~560 nm, then eases down to ~80 % by 800 nm. Visible light stays bright and colour-neutral, while the IR roll-off lets heat escape and protects downstream components.
Key advantages
Broadband visible reflection — >92 % R across 400 – 560 nm keeps projected images vivid and white-balanced.
Heat management — Gradual IR fall-off vents thermal energy, extending lamp, gel, and substrate life.
UV suppression — <20 % R 310-410 nm shields photosensitive media from harmful ultraviolet splash.
Lightweight, laser-cuttable aluminium — 0.5 – 1 mm cores cut cleanly yet resist warping under stage heat.
Stage-tough durability — Hard-oxide dielectric plus anodised metal shrug off humidity, solvents, and daily wipe-downs.
Typical applications
Ellipsoidal & profile spots — Swap glass gobos for a brighter, cooler mirror while the black back masks spill.
Architectural mapping — Steer vivid imagery onto façades without IR bake-back inside compact housings.
Follow-spot heat shields — Protect colour filters and iris assemblies with a cold-mirror insert.
Entertainment laser scanners — Use the bright face for beam steering, the dark face for aperture stops.
Optical test benches — Create low-cost folding mirrors that double as beam dumps when flipped.
Need odd shapes, a steeper IR drop, or AR-coated backs? KUPO Optics can prototype and ship BH-A20 variants fast to keep your production or research timeline on track.