This project builds a high-fidelity 365nm Ultraviolet (UVA) searchlight. Unlike the purple-tinted “395nm” toys, true 365nm light is nearly invisible until it hits a reactive surface, making it the perfect tool for biological and mineralogical surveys.

Fisa means “Bee” in the Yivalese conlang. This build mimics the “birds and the bees vision” spectrum, revealing hidden patterns in the natural world that are usually invisible to human eyes.

UV Radiation Hazard: 365nm is high-energy UVA. Because your eyes cannot “see” the beam, your pupils will not contract, allowing high-energy photons to hit your retina full-force.

* Do not stare at the beam. * Wear your shields. Even clear polycarbonate blocks the UV spectrum.

In the Pacific Northwest, the Fisa-Visor will make the following “pop” out of the darkness:

• Lichen & Fungi: Many local tree lichens (like *Lobaria*) and mushrooms fluoresce in vivid oranges and yellows.
• Millipedes (Xystodesmidae): Look for the “Yellow-spotted millipede.” Many of these glow a ghostly neon yellow/green under 365nm.
• Moths & Pollinators: Many local moths have wing patterns meant to be seen in the UV spectrum by other insects.
• Spider Silk: Certain orb-weaver silks glow bright white or blue, revealing complex webs in the brush.

Common findables in the PNW and Western Canada that react to 365nm:

• Sodalite / “Yooperlites”: Often found in riverbeds or coastal gravel; glows a brilliant, fiery orange.
• Wernerite (Scapolite): Primarily found in Quebec but traded locally; emits one of the brightest “canary yellow” glows in the mineral kingdom.
• Calcite & Agate: Many local quartz and calcite veins will glow ghostly white, green, or pale pink depending on the impurities.

• Scorpions & Insects: While scorpions (bright aquamarine) are rare in BC, many local Crab Spiders and Caterpillars (like Hornworms) glow neon green/yellow.
• Biological Traces: Animal urine (including rodents/pets) glows bright yellow-white, making it an essential tool for tracking or cleaning.
• Vitamins & Chemicals: Tonic water (Quinine) glows blue; Vitamin B12 glows bright yellow; Antifreeze glows “nuclear” green.

Total Est. Cost per Unit: ~$42.12 CAD. (~$29.72 if you can reuse a lipo cell battery.)

<comment> Note: This total assumes you are reusing an 18650 battery and host from a donor light. If buying new, add ~$20.00 for a Samsung 30Q and a Convoy S2+ host. </comment>

To protect the Seoul Viosys chip, we use a 1.8k Ohm safety resistor to cap the driver at 1000mA (1A).

[ CIRCUIT: THE FISA-VISOR ]

             ( + ) Li-ion 18650 Battery
               |
      +--------+----------+
      |                   |
      |                [SWITCH] 
      |                   |
      |         +---------v---------+
      |         |     [ CE / EN ]   |
      +-------[VIN+]    LD06AJSA    |
                |     LED DRIVER    |
      +-------[VIN-]                |
      |         |    [ ISET PAD  ]--+
      |         |    [     |     ]  |
      |         |    [1.8k Safety]  |
      |         |    [     |     ]  |
      |         |    [ 1k POT    ]--+ 
      |         |                   |
      |         |  [LED+]   [LED-]  |
      |         +----+-------+------+
      |              |       |
      |            ( A )   ( K )
      |            [  UV LED  ]
      |                 |
      +-----------------+

• Lichen Hunting: If you're surveying in the Vancouver area, head to a damp park like Stanley Park or Pacific Spirit. The variety of lichen that glows is staggering!
• Invisible Heat: Like the Void-Eye IR project, this light feels “dim” but is outputting significant energy. If the head of the Fisa-Visor gets hot, your heatsinking is working.
• The Filter Test: If you can see a purple beam hitting the wall, you need a thicker ZWB2 filter. A perfect 365nm beam should be almost invisible until it hits something fluorescent.

Caw! Keep your eyes shielded and your minerals glowing!