Black lights are not that different from any other type of light, whether incandescent, fluorescent, or just the age old candle flame. The construction of bulbs that create UV light is fairly simple, though there are several different ways to go about making “black lights”. A normal Fluorescent bulb creates light by channeling electricity through a conductive inert gas.
So whether you want to throw a “Rave” and know for sure who’s been brushing their teeth, or check your hotel sheets for blood, urine, and semen, black light is a phenomenon that everyone seems to enjoy! UVB radiation was once thought to be the dominant precursor to skin cancers from UV radiation. Ever wonder how tanning booths can make you burn in 10 minutes while it may take hours in sunlight?
Aside from revealing those around you who have dandruff, black lights have very practical purposes. Another ingenious use for black lights is to diagnose certain types of bacterial infections. Some common vitamins that fluoresce include A, and B vitamins, niacin, thiamine, and riboflavin.
On average in the United States, UVB radiation is most prevalent between 10AM and 4PM from April to October. Find Us On YouTube!Subscribe today to check out our free Daily Knowledge Youtube video series! UV lights are already recommended for use in public settings where air quality is a concern, such as hospitals and food processing plants. Global Market: They have a list of Energy Saving Lamp manufacturers and suppliers product from Energy Saving Lamp Suppliers and Energy Saving Lamp factories in China. Step 3: Box SidesNow glue together the 4 outer sides of the main box using the base as a guide (make sure you don't glue the base though). Step 4: Lid AssemblyGlue together the lid just as you did the main box but the lid can be assembled all in one go. Step 5: Fit, Fill, Sand and DrillFit the lid, hinges, catches and glue the apron and support in place. Step 6: HolesDrill holes for the PSU connector, and for a cable to go from the box to the lid. Step 7: UV LED PanelsI've mounted everything except the LEDs on the copper side of the board to keep the LED side uncluttered. Step 9: Negative and Positive Rail LinksNext solder on the links putting some insulating tube between the solder joints.
Step 10: Soldering the Resistors (surface mount style)Put dogleg bends in the resistors wires. Step 13: Solder 1st LegThen place a block of foam rubber (or something similar) on top and flip over. Step 15: Finish the RowNow solder the other leg of each of the LEDs in this row and clip all the legs to length. Step 16: Solder LinksYou need to create a bridge at the end of each series of three LEDs to ground. Step 17: Test that BlockAfter you've completed every 3rd row you can test that block by applying up to 12volts to the board.
Step 19: Make the Second PanelNow repeat the last 10 steps for the second panel, and fit standoffs to the six holes on each board. Step 22: Glass and FoamCut some thick foam rubber (about 1 inch thick) to the same profile as the shelf. Step 23: Assembly and WiringFit the lid, its hinges, the toggle catches and the LED panels.
Step 24: Final AssemblyFit the shelf, foam and glass assembly and the glass lid and its hinges and check that everything still opens and closes smoothly.
Step 25: TestingYou may want to check everything is OK by hooking up a bench PSU and turning the voltage up slowly. How to build an Ultra Violet Exposure box using LED's.Your last Veroboard project!A UV exposure box is an extremely useful piece of kit. The difference is that black lights emit most of their light waves just outside the range humans can perceive, in the Ultraviolet (UV) part of the spectrum. When a photon from UV light hits the phosphorous material, it causes the electrons to get excited and stray farther from the nucleus than they normally would.
Electromagnetism is one of the four fundamental forces in the universe, the others being gravity* and the nuclear weak and strong forces  This “light” radiation comes in many forms you probably recognize, from the long wavelength (low frequency radio waves, microwaves, and infrared waves), to the shorter wavelength (higher frequency ultraviolet waves, x-ray waves, and Gamma-ray waves).

They add a small amount of mercury inside the tube, or bulb, that will give off light photons when energized. So shut off all the visible light sources and let the black light show you what you most likely never wanted to see!
Tanning booths emit UVA light sometimes as much as 12 times that of what reaches us from the Sun.
Some bacteria naturally fluoresce under UV light and, as such, certain infections can be diagnosed by shining a black light on the patient. Bacteria have proteins in their cell walls that will bind with water, even when the microbe itself is dead. These materials all tend to have rigid molecular structures that contain delocalized electrons (ones that are not associated with any specific atom within the molecule). At 123 Air Repair, we focus on improving the quality of air in your house and that is why we offer services related to these lights. Homeowners can also take advantage of these products and it can be especially helpful for those with asthma. This will irradiate the majority of small airborne particles with microorganisms that are typically found flowing through the ducts. Here at Wikipedia, you’ll find all types of Black Lights including the Fluorescent, Incandescent, Mercury Vapor, and the LED. View their categories including the Germicidal Air and Water Purification Bulbs, Phototherapy and UV Testing Bulbs, Bulbs with Dark Filter, and the Blacklight Bulbs with White Finish. When a UV light wave hits an object containing substances known as phosphors, those phosphors will naturally fluoresce, and glow. When the electron falls back to its normal state, some of the energy is lost in the form of heat.
Right in the middle of these is a sliver of the spectrum that we can see with our human eyes, namely visible light waves.
This is because UVA radiation is less intense and it penetrates more deeply than UVB; so it was thought that they did not damage the outermost layer of the skin (epidermis). So the next time you feel like getting a tan via a tanning bed, know that people who use tanning booths are 2.5 times more likely to get squamous cell carcinoma and 1.5 times more likely to develop basal cell carcinoma, neither of which do you want to get! Most laundry detergents will also fluoresce, which helps your white clothes glow extra bright under a black light. I hope you don’t mind a little constructive criticism, because otherwise this is a well written and informative article. Since this technology is relatively new, you won’t find many other companies that offer this service and our experience and training ensures that you get the best possible results.
The UV light works to fight bacteria, spores, viruses, fungi, mold, and mildew by attacking their RNA or DNA and breaking them down completely.
Give us a call or send us an email to set up an appointment to install, maintain, or repair your UV light system. It can also be used to make other things such as intricate photo etched parts (a subject for another instructable). Switch mode power supply's are far more energy efficient than most other types and are also very stable.All the other parts and materials are easy to find. When the UV light wave is reflected back to your human eyes, it now has less energy, therefore a shorter wavelength. Instead of creating light in the visible spectrum, the coating absorbs harmful UV-B and UV-C light waves and creates UV-A waves. All of the light that is created by the heated filament is filtered out, except those waves in the infrared and UV-A spectrum.  The filter absorbs the rest, which is why this type of black light tends to get extremely hot, even for an incandescent bulb, and has a short lifespan. Numerous recent studies have disproved that theory and UVA waves have been shown to damage skin cells at the basal layer of the epidermis, which is where most skin cancers occur. For you teenage girls out there who just love your booth time, you should know that the first session you get in a tanning bed will increase your risk of melanoma by 75%. This type of bacteria has 191 known species and is the second leading cause of infections in hospitals. Our expert staff at 123 Air Repair can even give you more information about how the system works.
The trouble is they can be a little pricey for the hobby enthusiast especially if you want the double side type.
To get the visible light out of the bulb, a phosphorus coating is applied to the glass and reacts to the UV waves and creates the visible light hospitals everywhere are famous for! UVC wavelengths are absorbed by the ozone layer and as such do not reach us here on the Earth surface.

Yes, that’s just after the first exposure!  Save yourself a lot of potential medical grief and improve how your skin will age by skipping purposefully tanning altogether.  Better to be pale than prematurely wrinkly or, you know, dead from skin cancer. When attracted to the source, they will receive a life-ending shock from whatever electrical mechanism that surrounds the light.
Some ski resorts have caught on to this little phenomenon and have started adding dead microbes to their artificial snow-making machines. According to the Standard Model of Particle Physics, it is a currently accepted notion that gravity is indeed a fundamental force.
This instructable outlines the construction of a double sided UV exposure box using the recent generation of high brightness UV LEDs.Why use LEDs?LEDs are far more energy efficient than either incandescent or fluorescent lamps offering between 5-10 times more efficiency making them cheaper to run and kinder to the environment.
The end result being, you cannot see the majority of the light coming from the source, but you can see its reflection off of objects containing phosphors. One of the reasons humans can see more of the light from a bug zapper, than from any other black light, is that bug zappers use clear glass (because it’s cheaper) instead of filter coated glass.
Scientists have also discovered that natural snow contains large amounts of these microbes. As mentioned, there are several types of body fluids that will glow under UV light, blood, semen, and urine for example. Though helpful for the ski resorts, one type, Pseudomonas syringae, is a nuisance for farmers as it almost immediately destroys crops and plants below freezing. LEDs have a far greater life span than the other types of lamp measured in decades rather than months. I've included all the CAD drawings and schematics as metafiles so they're easier to read when you print them out.
The frequencies being emitted are also in a tighter band making UV LEDs safer than the traditional UV tubes. There's also just something cool about LEDs, I can't put my finger on it, but ever since I was a kid I've found them to be one of the more fascinating electronic components.Is there a disadvantage to using LEDs?Not really, however the UV exposure box I have detailed here is a little less powerful than the commercially available ones. This means that your exposure times will be around 2 ~ 3 minutes as opposed to 30 ~ 40 seconds, but come on, do you really need your PCB's to be produced that quickly? If you connect more voltage, they'll attempt to conduct infinite current, which results in the Magic Smoke(TM) leaving the LED (burning out). If one of the rows has a lower voltage drop than the others (and since they're inequal, there will always be a row with the lowest drop), the voltage across the whole circuit will be equal to the drop of that row.
Then that row will conduct all the current that was meant for all the rows, because the others don't conduct anything at all. When you start soldering use your continuity meter for every solder joint to ensure there are no short circuits between adjoining rails. If necessary do a practice circuit of 2 vertical blocks (of 3 leds each) on scrap board to make sure you have continuity working between blocks.
Place temporary unsoldered leds in the 3 corners, ie., other than the corner where you are soldering the first led.
Then place the board on an even flat surface with the temporary leds facing down, whereupon they act as stabilizing legs. Zidbits April 30, 2011 Why Can’t Anything Go Faster Than The Speed Of Light? Zidbits May 18, 2011 Can A Human Be Frozen And Brought Back To Life? Zidbits February 21, 2011 Why Do Men Find Women With Larger Eyes Attractive? Zidbits June 2, 2011 Top 10 Biggest Things In The Universe Zidbits March 5, 2011 How Far Have Our Radio Signals Traveled From Earth?
Zidbits November 28, 2015 Does A Diamond Really Last Forever? Zidbits October 27, 2015 How Does Fusion Power Work? Powered by an uncontrollable curiosity.Contact Us - Privacy Policy & Terms Of Use - AboutArming the world with knowledge since 2010 - Learn Something New Every Day!

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