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COMPATIBLE WITH LED LIGHTS: This round Fresnel lens works with LED lamps, stage lights, flashlights and fishing lights to adjust the beam and output angle. DIY PROJECTOR & VR GLASSES: A practical optical lens for building DIY projectors and VR glasses, giving you flexible control over light direction. MAGNIFYING OBSERVATION: Use this flat magnifying lens to enlarge images or fine details for clear, close-up observation. OPTICAL EXPERIMENTS: Suitable for various optical experiments, research projects and optical product development. PMMA ACRYLIC MATERIAL: Made of PMMA/acrylic with 92% light transmittance, 1.8mm thickness, 0.3mm thread pitch, working from -40°C to +80°C.