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Questions tagged [uv]

Ultraviolet electromagnetic radiation, which has a shorter wavelength than visible light. Use for questions about ultraviolet radiation in the context of electronics design, such as the use of ultraviolet emitting LEDs, erasure of EPROM using ultraviolet, etc.

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Choosing UV resin or epoxy for diffusing LED on PCB

I have a sandwich structure made out of two boards. The first one has an LED on its top side. The second one is 5 to 10mm thick and sits on the first board. It has a milled slot above the LED on the ...
Prot's user avatar
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1 answer
151 views

How does the filament of an ultraviolet bulb differ from a normal bulb?

This is the 75W UV bulb I bought (datasheet; page 2 is English.) I use it to cure UV resin. I suppose the paint on the glass of the bulb is a filter which simply only permits UV light to go through. ...
zomega's user avatar
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How can you use ballast-powered flouresecent lamp outputs to power LEDs?

We have a 2G11-socket 36W germicidal UVC lamp in our air ducts (Honeywell UC36W1006), and since UV-C LEDs are readily available, I thought maybe I could make a PCB with a bunch of UV-C LEDs on it as a ...
KJ7LNW's user avatar
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2 votes
2 answers
148 views

How to find irradiance of UV LED?

I have a UV LED with the following specifications: optical watt: 0.103 W beam angle: 15 degrees distance from surface: 2.4 cm Also the circle created at that distance by my calculation is 0.313 cmsq ...
Abhay Rajkarnikar's user avatar
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Conversion of portable fluorescent to UV-C lamp

I am modifying an off-the-shelf portable fluorescent light to a UV-C light for use in field illumination. I found a 13W UV-C 4-pin bulb that is the same physically as the OEM fluorescent, so thought I ...
MrTim's user avatar
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1 answer
68 views

Using a Larger MFD Capacitor with a UV Lamp Ballast

I am attempting to repair a UV lamp for curing resins and epoxies. I determined the capacitor was the problem and ordered a replacement (7C100M33R). I got the last one the site had available - and ...
gban's user avatar
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1 answer
184 views

Proper ballast for UV-A fluorescent bulbs

I have been tasked with improving a certain UV curing box product which uses Philips Actinic BL TL-DK 36W UVA bulbs. These are usually used in large bug zappers so I suspect that they usually are run ...
Sean Breheny's user avatar
0 votes
2 answers
261 views

Connect 36 UV LED board to 12 VDC source

I have a UV LED board with 36 LEDs connected in series. The board's label says it works with 12 V so I tried to connect it to an AC-12 VDC converter, but it just works for a minute and then starts to ...
DigitalAutodidact's user avatar
4 votes
0 answers
370 views

Ultra-fast driver circuit for low-power LED

The goal is to drive a low power LED at a very high frequency, with pulses of ~10-100ns width in order to produce a very narrow burst of light. The pulses do not need to be closely packed together, ...
lobis's user avatar
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1 answer
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Alternative (LED?) for F25T8/350BL fluorescent tube [closed]

I have a bug light that uses a couple of F25T8/350BL fluorescent tubes. The bulbs are on their way out, and the price for replacements is ridiculous. They are about 18" in length, and 1" in ...
Alan's user avatar
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UV Epoxy Encapsulated LEDs

I recently discovered 385-400nm UV LEDs are available in epoxy encapsulated forms. Seemingly identical to the traditional through-hole red or green LED. How does this work? I was under the impression ...
DKNguyen's user avatar
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2 votes
2 answers
955 views

Understanding the specs of an electronic ballast (UV-Tubes)

I got lost on the topic of selecting the right electronic ballast for 4 UV-tubes (Cosmolux S pink 15W). I have learned about magnetic ballasts and starters, about electronic ballasts and connecting ...
Stefan's user avatar
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0 answers
238 views

UV masking with an LCD

I am planning to make a machine that uses an LCD screen as a mask for etching PCBs. However, I am concerned about the type of LCD that I would need as well as the accuracy that I would get. My main ...
avilazazel's user avatar
1 vote
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209 views

Transparent displays that allow UV light/sunlight to pass through them?

Is there a type of digital display that can work to let sun through it, so that the dark pixels block the UV, and transparent pixels let the UV through? I'm aware of monochrome LCDs for a resin ...
Curiousmarble's user avatar
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1 answer
184 views

Are ultraviolet LEDs used in consumer lights? (xmas lights)

I took apart a bulb on this strip of purple christmas lights and was surprised to find that the LEDs inside are actually purple 3mm LEDs. Naturally, I looked into some replacements but then the ...
BobaJFET's user avatar
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1 answer
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Removing collected charges in a IC CMOS circuit exposed under a 30keV electron beam source

I would like to know if there is any mechanism (for example UV light exposition) to remove charges collected in an IC CMOS circuit that was exposed under a 30keV electron beam source. Presumably, ...
Jorge Johanny Sáenz Noval's user avatar
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1 answer
545 views

UV-C lamps flickering problem

I have got 8 UV-C lamps connected to a portable battery(AC) through a smartplug. I am using 4 UV Ballast with 2 lamps connected to one ballast. I am controlling the lamps with help of a wireless ...
siddharth's user avatar
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69 views

Supervisory watchdog to assure UV LEDs are off and stay off during non-use

I'm designing a circuit consisting of 3 pairs of LEDs. Each pair has one UV-LED and a white LED. The pairs will be turned on consecutively and for about 1 second each. Between each use there will be ...
Kano's user avatar
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0 answers
34 views

Coin cell UV pendant Q2 [duplicate]

I am a beginner with LED lights, but would like to use a 5mm 365nm UV LED diode to make a pendant with a small fluorescent crystal. I would like to create a very simple, very compact circuit with a ...
Devika Menon's user avatar
2 votes
1 answer
721 views

Coin cell to power a 5mm UV LED?

I am a beginner with LED lights, but would like to use a 5mm UV LED to make a pendant with a small fluorescent crystal. (This is what I purchased (https://www.amazon.com/uxcell-365-370nm-Ultraviolet-...
Devika Menon's user avatar
0 votes
1 answer
86 views

How to calculate the time needed for the UVC to be turned on and disinfect a specific space/location?

I have 3x60W UVC tube with a 254 nm wavelength. I want to know until up to what meter the range will cover and disinfect the area and how to calculate the time needed for these 3 tubes to be turned on ...
Rimar Virtus's user avatar
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0 answers
57 views

Pass bandwidth of backing light for LCD display

A stardard industry LCD display is composed of several parts. Polarizer film and color filters produce and image by masking the light from a source positioned behind the LCD itself, the so called ...
Francesco's user avatar
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1 vote
1 answer
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Electrostatic arc safety

I'm experimenting with early electrostatic devices, and I'm measuring spark gap length to determine voltages generated. How dangerous is it to observe these arcs with the naked eye? Should I wear ...
Peter_X_Weaver's user avatar
0 votes
1 answer
61 views

Getting the optical power of a UV-LED using a spectrometer data

if it is possible can you let me know the way to get the radiated power of a UV-LED using the output data from the "Ocean optics- Maya pro 2000" spectrometer, or the calculations needed to ...
KamelK's user avatar
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0 votes
1 answer
103 views

UVC Lamp causes Atmega 328P to malfunction

I have got an Atmega328p which connected to a TFT LCD 1.3 inch using SPI. The Atmega 328P is powered through a 5V adaptor. The problem is most of the time when I switched on the UVC Lamp the LCD will ...
shafiyyah's user avatar
1 vote
0 answers
115 views

UV protection for character LCD

I am using 20X4 character LCD display. Like these: https://www.alibaba.com/product-detail/big-size-20x4-line-white-color_62471561311.html?spm=a2700.pc_countrysearch.main07.78.2bafd2a7u344W2 The ...
user3560453's user avatar
0 votes
1 answer
133 views

can you turn a visible laser pointer into a uv one?

I was wondering if there is anything I can do to make a visible laser pointer uv with (or without) messing with the laser. like if I simply shot the laser pointer through some device or screen that ...
Af91's user avatar
  • 29
0 votes
2 answers
102 views

Problem with understanding EPROMs and how they're written to

I've got a problem understanding how an EPROM (UV-erasable) works. This question may seem very dumb, but what would happen, if I just try to write contents to an EPROM, which has already been written ...
s137's user avatar
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0 votes
1 answer
163 views

How to specify UV high brightness LEDs?

I'm trying to find high brightness UV LEDs appropriate for this project: https://www.instructables.com/id/UV-LED-Exposure-Box/ which includes: "The most critical parts of this project are the UV ...
user1621287's user avatar
1 vote
0 answers
61 views

How to power a 17W T5 Germicidal UVC Lamp?

I recently bought a SBL 350T Germicidal Lamp from American Ultraviolet, but have been having some trouble finding out how to power the lamp since I do not have much experience in lighting and the base ...
Ruben T's user avatar
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0 votes
3 answers
1k views

Removing the phosphor coating in fluorescent lamp

Any ideas on how to remove the inner phosphor coating on the inner surface of fluorescent tube lamp turning it into a UV lamp?
USER249's user avatar
  • 661
1 vote
0 answers
75 views

Measure distance to object with angular precision - invisible for camera

I want to build myself an arduino based follow-focus. There is one mode intended for using a joystick for manual control of focus and zoom. This code already works a treat. Now I want to add a ...
HeartOfGermany's user avatar
0 votes
0 answers
79 views

How to power bulbs expecting 24V AC from a car's "cigarrete" socket?

I'm turning the trunk of my car into a UV-sanitizer chamber -- so that, by the time I return from the supermarket, the bags and the packages handled by strangers there are sterile. To this end I ...
Mikhail T.'s user avatar
0 votes
1 answer
69 views

How to power 83V UV-C germicide tube?

I'm currently working on a UV-C germicide lamp, and among the things I have to do, is to drive four 83V OSRAM 21283 G55T8/OF 55W G13 T8 Tubes. Here's a link to the tube, and the datasheet. My ...
Dape97's user avatar
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0 votes
3 answers
221 views

Covid-19: can a UV-C source be improvised from a standard mercury vapor lamp?

I suggest it because the usual professional UV-C sources are in short supply and very costly. A common 175 W mercury lamp designed for illumination includes the quartz 'lamp' tube itself, inside an ...
user216912's user avatar
1 vote
0 answers
232 views

Repurposing CFL ballast for different bulb (UVC)

I am attempting to repurpose the (electronic) ballast contained within a CFL lamp to power a UV-C bulb (mercury discharge, uncoated tube) for disinfection purpose, and out of general interest in ...
Blkbox's user avatar
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0 votes
3 answers
702 views

Are these UV-C tubes meant to be run only on pure AC ballast?

I’ve this portable small T5 4W UV-A 300-400nm black light tube lamp with me. I’m trying to see if it’s possible to use a 4W UV-C lamp in the same fixture. But I noticed that the lamp has the violet ...
The_Vintage_Collector's user avatar
0 votes
1 answer
326 views

How does one match irradiance to Luminous Intensity in Candela of source?

A light source has an Irradiance of about 1.6 W/m²/nm at wavelenght 385nm and an LED: Peak Wavelength 385nm Viewing Angle 30 ° Luminous Intensity 80 mcd If this light source shines on a ...
user avatar
0 votes
1 answer
378 views

Can I use USB to power a flashlight that runs on 3*AAA or 1*18650 battery? [closed]

I am thinking of buying this UV flashlight. It runs on either 1 18650 battery (4.2v) or 3 AAA batteries (4.5v). Since the flashlight can already take 4.5v, will it be safe to run on 5v USB? I found ...
Catculations's user avatar
0 votes
0 answers
35 views

LCD for SLA 3D Printer Resin Curing

I'm doing some research on what types of LCD displays can be used to filter and pass UV light for resin curing - specifically in the context of building a DIY 3D SLA printer. The community commonly ...
Robby Wasabi's user avatar
0 votes
1 answer
414 views

Magnetic ballast with g23 bulb with capacitor

I am trying to make a UV-b photo-therapy light and want to make sure I'm understanding the circuitry correctly-so i don't hastily burn a $50 bulb. Im using a Phillips PL-S 9W/01/2P (link here). It's ...
user167026's user avatar
3 votes
1 answer
107 views

Ultraviolet sensor response curve

I did a search on "ultraviolet sensors" in this forum, and came up with only three results, so, it appears, that this has not been asked before. I have a hand-held ultraviolet light sensor from ...
runcyclexcski's user avatar
4 votes
4 answers
3k views

Can an EPROM be "refreshed" without UV erasing?

I have lots of AM27C512 EPROMS (with the UV window) which are quite old (1980's.) Using a Xeltek SuperPro 3000U, most can still be read and verified. A few have failed outright and were replaced. ...
rdtsc's user avatar
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3 votes
3 answers
4k views

UV light masking and LCD screens

Not sure if this is the right stack to ask this question on, but it relates to an engineering project that I and a student electrical engineer are starting. Can an LCD screen be used as a masking ...
Pliny's user avatar
  • 133
0 votes
2 answers
2k views

Can you damage an LCD screen with a camera flash, high-powered flashgun/speedlight?

I'm curious as to what the limitations are in regards to uv radiation on LCD screens when subjecting them to high intensity light sources such as camera flashes (such as a nikon or canon speedlight). ...
cwinhall's user avatar
0 votes
3 answers
2k views

Safety of "UV" LED

I am curious as to whether LEDs like these ones https://www.led4everything.com/index.php/product/waterproof-smd-purple-violet-led-strip-light/ are harmful, they are advertised as UV. But are they just ...
Luke Callan's user avatar
0 votes
1 answer
534 views

g23 socket and 11W UV-C bulb

because UV-C machines tend to be expensive, our lab working on biological/biochemical research has reverted to attempting to build a machine from scratch. Therefore, we recently purchased a G23 ...
mapema's user avatar
  • 1
0 votes
1 answer
2k views

uv light dc current [closed]

I am working on a project which uses UV rays to kill bacteria in water and make it safe to drink. The people who would use this do not have access to an AC source, so I need the UV Light source to be ...
Ana dlF's user avatar
  • 11
1 vote
6 answers
1k views

How could I amplify the output from this UV photodiode sensor

I have been able to use the following photodiode sensor board to detect changes in the output of the sensor when a UV plasma is active. However, changes sensed when the UV plasma is active are very ...
Johan's user avatar
  • 23
-1 votes
2 answers
347 views

The current state of UVC LED technology

I saw this kickstarter for a self cleaning water bottle. It's a pretty good idea, and is physically plausible, but I'm a bit skeptical about their UVC LED. UVC LEDs do exist (and they have a picture ...
BeB00's user avatar
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