Battery Operated Short Wave UV-C (254nm) and Long Wave UV-A (365nm) Lamps come complete with 4W tube and filter assembly.
M100 Enhanced Kit with Ultraviolet Lamp, Shortwave and Longwave Tubes, 6 Fluorescent Specimens, and Safety Glasses. I recently acquired a UV Tools M100, an ultraviolet light regularly priced under $100 that has caught my eye in terms of features and performance for its price.
This light will serve nicely as an entry level ultraviolet source for rockhounds with a developing interest in fluorescent minerals and will also make an excellent educational gift. Because ambient visible light washes out and obscures the relatively weak light emitted by fluorescing minerals, the effect is best viewed in the dark.
A clearly marked 3-position sliding switch is provided on the M100 to control the flashlight and ultraviolet lamp.
The shortwave ultraviolet lamp installed in the M100 is a 6 Watt F6T5GL germicidal ultraviolet tube, 9 inches in overall length with a G5 bipin base. The F6T5GL ultraviolet lamp has an average rated life of 4000 hours, which is approximately equal to five and a half months of continuous, around the clock use. The bottom line is you should exercise simple common sense and wear eye protection while using ultraviolet lights, and turn them off when handling specimens beneath them with your bare hands.
While the majority of minerals that fluoresce under ultraviolet light exhibit the fluorescent effect under shortwave ultraviolet, there are some fluorescent minerals that fluoresce only under longer wavelengths of ultraviolet light, or fluoresce with different colors of visible light when exposed to different wavelengths of ultraviolet light.
The arms of the stand securely cradle and elevate the M100, positioning the filter on the underside of the M100 approximately 4 inches above the stand base.
Mounted in the stand, I can use the M100 to view specimens hands off, and the stand has already proven to be an invaluable accessory for doing fluorescent mineral photography.
Reproduced below is the instructional guide included with the M100 and UVTool's 90-day warranty against defects in material and workmanship.
This handheld UV Lamp provides you with both long wave (365 nm) and short wave (254 nm) capabilities, making it an excellent selection for locating all types of evidence at a crime scene.
You must have JavaScript enabled in your browser to utilize the functionality of this website. This economical shortwave ultraviolet fluorescent lamp now also includes a longwave ultraviolet LED lamp so you can experiment with both shortwave and longwave ultraviolet light.
This one economical, portable provides both shortwave and longwave light, making it a good investment for a rock collector. Quick Science Investigation: Are you wondering if your safety goggles, sunglasses, or regular glasses will help protect your eyes against low-level ultraviolet light like our battery-operated UV lights? I bought one for use at school with our 6th grade science students to see if it would work for our rocks and minerals section. This is a no-brainer deal offering exceptional value for anyone considering the purchase of an entry level ultraviolet light or needing a portable unit for field work. Also included on CD is "The Story of Fluorescence" e-Book and and a Fluorescent Mineral Slide Show. The M100 is a battery powered field light employing a 9 inch, 6 watt shortwave ultraviolet tube in conjunction with a quartz filter as its ultraviolet light source.
The switch is moved to one end position to turn on the ultraviolet lamp and to the other end position to turn on the flashlight.

Batteries are installed by unscrewing and removing a threaded cap on the end of the M100 opposite the flashlight. Because alkaline batteries have a higher storage capacity than consumer grade rechargeable NiMH batteries, they may be preferred for remote or extended field applications entailing longer periods of use where line power to operate a NiMH battery charger is unavailable. The construction and operation of germicidal ultraviolet lamps are similar to ordinary low pressure mercury vapor fluorescent lamps, but in germicidal lamps the tube is not coated with a fluorescent phosphor. The visible light output washes out and interferes with the perception of ultraviolet induced fluorescence, so a special quartz glass optical filter that is transparent to light at ultraviolet frequencies, but opaque to light at visible frequencies, is employed between the ultraviolet tube and fluorescent specimens. The filter will also age and "solarize" (darken) due to exposure to ultraviolet light and has a rated life similar to the lamp. Our sun emits light across the entire ultraviolet spectrum, including the UVA (400-315nm longwave), UVB (315-280nm midwave), and UVC (280-100nm shortwave) bands. According to ANSI, "adequate protection should be provided by clothing, gloves, opaque materials, and ordinary window glass. Safety glasses made from polycarbonate plastic (Lexan) are effective optical filters for blocking shortwave, midwave and longwave ultraviolet light. Compatible 307nm midwave and 365nm longwave ultraviolet tubes are available from UVTools for M100 users desiring to expand the spectral range of their lights. Access to the tube is obtained by unscrewing the battery cap and sliding the molded end piece with strap yoke off the light body, releasing the lamp cowl and filter. After cutting out the stand parts with a scroll saw and gluing them together, I painted the assembled stand with flat black spray paint. If you don't happen to have a scroll saw and some suitable scraps of plywood laying about in your shop, a serviceable stand could be engineered and fashioned from some heavy fluted cardboard. UVTools sources a wide variety of Ultraviolet lights suitable for educational, hobby and professional use. The lamp is supplied with a LONGLIFE™ filter glass with a sliding, dual-wavelength selector cover.
Shortwave ultraviolet light is just the right wavelength to vibrantly illuminate many fluorescent minerals that you collect. This lamp produces fluorescent shortwave light at 4 watts and 254nm wavelength and it produces LED longwave light at 375nm wavelength.
Many of these types of glasses have lenses made out of polycarbonate, a natural low-level UV light filter. The M100 comes packaged as a standard kit that includes a pair of polycarbonate safety glasses and a fluorescent mineral specimen.
There is also a good deal of "wow lookit that" factor here, and so I am keen on ultraviolet lights and fluorescent minerals as vehicles for stimulating and involving inquiring minds in the science part of Earth science. The M100 is compact and light enough to stow and field carry in a small day pack or a belt pack with a large carry pouch when not in use. Integrated into one end of the M100 is a visible light flashlight, a rather nice touch on an ultraviolet field light. Rather than being made of ordinary borosilicate glass, which blocks shortwave ultraviolet light, germicidal lamp tubes are made of fused quartz or a special glass with high ultraviolet transmissivity. Assuming they turn their lights off when not in use, most M100 users are unlikely to exceed the rated life of their lamps and filters.

Fortunately for us, the Earth's oxygen atmosphere and ozone layer absorb all but a small fraction of the sun's ultraviolet radiation. UVTools also offers an M101 kit, which expands the M100 shortwave kit reviewed here with midwave and longwave tubes and an additional fluorescent specimen. Check out the UVTools website for further information on their full line of ultraviolet lamps spanning the price and performance spectrum from their $9.99 M14 Longwave LED Kit to their $1250 W57 190 Watt Shortwave Ultraviolet Field Lamp.
The LONGLIFE™ filter glass ensures higher initial UV intensity and is resistant to solarization.
Some minerals fluoresce, or glow, under shortwave ultraviolet light, others under longwave ultraviolet light, and others fluoresce differently under both! Wear UV filtering goggles or glasses if using this low-level ultraviolet light source for extended periods.
Test your goggles or glasses by first shining a UV (shortwave or longwave) light on a mineral or other object that fluoresces brightly.
The flashlight employs a single, high output LED, and while it is sufficiently bright to help aid you from stumbling over rocks or off a cliff in the dark, I was less than impressed with the brightness of the light output by the M100's flashlight compared to dedicated purpose, multi-LED flashlights I've used. I elected to power my M100 using 1.2 volt, 2500 mAh rechargeable NiMH batteries, as they are more economic over time than one-shot alkaline batteries.
These differences combine to allow the 253.7nm shortwave ultraviolet light produced by the lamp's mercury arc to pass out of the lamp unmodified.
Should you manage to wear yours out, or accidentally break your filter or shortwave tube, replacements are available from UVTools. It is the small fraction of the sun's ultraviolet light that makes it through the Earth's atmosphere that causes sunburns and genetic damage resulting in skin cancers. The tube is released by rotating it, similar to replacing a fluorescent tube in a shop light or ceiling mounted fluorescent light fixture. These images were photographed under my M100 with a Nikon Coolpix 8000 digital pocket camera. Then put the UV lamp inside the goggles or glasses and shine it on the same fluorescing object through the lens. While man-made sources of ultraviolet light are many orders of magnitude less powerful than our sun, there won't be 93 million miles of space and 60 miles of atmosphere between you and an ultraviolet lamp. Willemite with calcite from Franklin is among the brightest of fluorescent specimens and is ideal for demonstrating the phenomena of fluorescence with a shortwave ultraviolet lamp.
It would require an ultraviolet light meter, which I didn't happen to have at hand, to perform an empirical test and actually quantify any difference in ultraviolet output using the different type batteries. All ultraviolet light sources should be handled with caution, understanding and respect for their potential risks.
Note the color change of fluorescent light emitted from the Nuevo Leon calcite under different wavelengths of ultraviolet light.
The object will no longer fluoresce where the UV light has been filtered by polycarbonate lenses!

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