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**310nm Midwave UV Display Light — 36 LED with Dichroic Filter!**
The missing waveband, in a display light. This is the midwave brother of our best-selling 365nm display light — same 36-LED fan-cooled build, same size, same everything — except this one runs at 310nm midwave UV (UVB) and uses a dichroic filter instead of ZWB2 glass. If you collect fluorescent minerals, you already know the dirty secret: longwave (365nm) and shortwave (254nm) get all the attention, but a whole list of minerals save their best colors for midwave — and plenty of pieces that look like a dud under your 365nm light wake right up at 310nm. This is the light that shows you the third response your collection has been hiding.
**Why 310nm midwave?** Fluorescence is waveband-specific — a mineral absorbs UV energy and re-emits it as visible light, and which color you get (or whether you get one at all) depends on the wavelength doing the exciting. Midwave sits between longwave and shortwave, and it excites activators the other two bands miss or only weakly reach. Serious fluorescent collectors run all three wavebands for exactly this reason. The dichroic filter does the same job as the ZWB2 on our 365nm light — it passes the 310nm UV and blocks the visible light spill — so what you see is pure fluorescence, not lamp glare.
**Minerals that respond to midwave (310nm) UV:**
- **Willemite** — the Franklin, New Jersey classic; glows green (also responds to shortwave)
- **Calcite** — red, pink, and orange from many localities; some calcites barely react to longwave and light up under midwave
- **Fluorite** — blue to blue-violet
- **Aragonite** — white to pinkish, often with a nice phosphorescent afterglow
- **Scheelite** — blue-white
- **Hydrozincite** — bright blue-white
- **Powellite** — yellow
- **Scapolite (wernerite)** — yellow-orange
- **Hyalite opal** — green
- **Zircon** — orange to yellow-orange
- **Autunite** — green (radioactive — handle and store with appropriate care)
- **Agate and chalcedony** — greenish surface fluorescence on many pieces
- **Yooperlites (fluorescent sodalite)** — yes, they respond at 310nm too; same stone, different show under this light
Every specimen reacts a little differently, and locality matters — that's the fun of a third waveband. Pieces you've walked past for years deserve one more look under this light.
**The light itself:** Thirty-six 310nm LEDs in a 6x6 array, each in its own reflector, behind a dichroic filter. A DC brushless fan and a finned aluminum heatsink keep it cool through long display sessions. The steel yoke handle adjusts with star knobs so you can aim it and lock it, and the cord has an in-line on/off switch and a standard US plug. It's the same light I use in my shop and at gem shows, now in midwave.
**Details:**
- 310nm midwave UV (UVB) display light
- 36 LEDs in a 6x6 array with individual reflectors
- Dichroic filter — passes 310nm UV, blocks visible light spill
- Fan-cooled: DC brushless fan + finned aluminum heatsink
- Adjustable steel yoke handle with star knobs
- In-line cord switch, standard US plug
- 6.5 x 6.5 x 4 inches; weighs 1 pound 12 ounces
- 1-year warranty
**Safety — please read:** 310nm is UVB, a stronger band than the 365nm UVA in most UV lights. Never look directly into the lit lamp, wear UV-blocking safety glasses while using it, and avoid shining it on skin for extended periods. Keep it away from children's eyes. Used with basic care, it's a safe and incredible tool — just respect the waveband.
**Care:** Wipe the filter glass with a soft, dry cloth. Run it in a ventilated spot so the fan can do its job, and store it dry.
