Pocket Lighthouse® Magnetic Fresnel Lens Smartphone Flashlight Attachment | Mini Lighthouse-Style Beam, For Tours, Gifts & STEM Projects, Emergency Signaling

Pocket Lighthouse – Miniature Lighthouse Optics for Your Smartphone Inspired by Augustin Fresnel’s historic lighthouse lenses, this attachment creates a compact lighthouse-style beam. How It Works: Flat sheet Fresnel lenses need ~120 mm focal distance and cannot focus a smartphone LED. This lens uses deeper prism geometry with a working distance of ~21 mm for efficient beam formation. Not an Imaging Lens: Designed for illumination, not magnifying text or focusing sunlight. How to Align: Center the lens over the LED. Use the included 40 mm disk for flexibility. Raised cases may interfere. Lightweight PET Construction: Recyclable PET, only 35 g. Great for tours, STEM, and emergency signaling. Educational + Novelty Function: A souvenir that doubles as a STEM teaching aid demonstrating real lighthouse optics.

• LIGHTHOUSE-INSPIRED OPTICS: Miniature version of multi-stage Fresnel principles pioneered by Augustin Fresnel
• COMPACT SHORT-FOCUS DESIGN (21 mm): Works close to the LED, unlike flat Fresnel sheets requiring 120 mm offset
• ILLUMINATION LENS, NOT A MAGNIFIER: Designed for beam shaping, not reading or solar focusing
• ALIGNMENT REQUIRED: Center lens over LED. 40 mm metal disk gives flexible placement. Raised cases may interfere
• LIGHTWEIGHT RECYCLABLE PET: Only 35 g. Suitable for lighthouse tours, STEM demonstrations, and signaling
• NOVELTY + EDUCATIONAL TOOL: Originally created for lighthouse gift shops and STEM learning
• MAGNETIC ATTACHMENT SYSTEM: Includes 40 mm metal disk for secure and adjustable positioning on your smartphone flashlight
• EMERGENCY SIGNALING CAPABILITY: Creates a focused lighthouse-style beam that can be used for emergency signaling and visibility in low-light conditions