Questions tagged [fluorescent-lamp]

A fluorescent lamp or fluorescent tube is a very low pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light.

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Can an LED "fluorescent replacement" tube be powered without a ballast?

Two high-rep answers seem to have made the same misunderstanding, so to clarify: My LED replacement tubes DO work with an existing, unchanged magnetic ballast. 2 fluorescent tubes out, 2 LED tubes ...
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Are fluorescent tubes dangerous?

I'm disassembling a Sega GameGear. The capacitors inside are all rated 50v or lower, so it shouldn't be hazardous in that regard (I will discharge them anyway just to be sure). However, the metal ...
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Efficiency or longevity issues when using 2 lamps on a 4-lamp fluorescent ballast?

To answer this question I guess we need to know the circuit construction details of commercial electronic fluorescent ballasts. Is there a downside (either power efficiency or ballast longevity) when ...
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What is the typical voltage for driving LCD fluorescent backlight tubes?

I ran into this old cockpit/pilot room for heavy mining machinery in which there was an LCD display that's not lit properly, that is, the image was there but the backlight clearly was gone. Upon ...
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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?
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Power consumption in watt for fluorescent lamps

I live in Egypt where the AC voltage is 220v. Yesterday i bought two fluorescent lamps (60cm and 120cm). I toke the following photos for the what is written on those lamps: Please have a look to the ...
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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 ...
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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 ...
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How does this electrical ballast need to be wired to the flyback transformer?

I just got myself a flyback transformer and an electrical ballast for fluorescent lamps as I heard those can be used together. The electrical ballast is supposed to generate a high frequency which ...
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Can a fluorescent light electronic ballast fail and still supply voltage?

I am trying to debug a failed fluorescent light fixture. T8, 1x36W. I have checked the tube (vs. both a new one and a known working one), and this is not the problem. So I thought it must be the ...
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Why is my fluorescent tube orange on one side, white on the other and dark in the middle?

I have a ~60 cm fluorescent tube light that is failing. ~10 cm on one end glows orange, ~10 cm on the other end glows blue-white (normal fluorescent light color) and the middle 40 cm is dark. ...
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ECG for fluorescent lamp and grounding

I have three OSRAM Quicktronic DIM T8 1x 18W in the same room. One is near the wall outlet, the other two are each about 10 m away. Each one is very close to the respective T8 tube. While the first ...
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Rated vs. actual power usage of a linear fluorescent lamp

After having some power issues, I've decided to investigate the largest power drains in our company, and I've arrived at a realization that 128 lights adds up to a lot of power (and that's not even ...
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Driving 4W Tube Lamp with 900mA LED Driver [closed]

Can i use an LED driver circuit (like this) to power a 4W fluorescent lamp (like this) from a DC power source? Voltage = 4.44V | 4W = Voltage X 900mA While i hope to use 3 AAA batteries (4.5V)...
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How long will a 12v car battery last using a 100w lamp only? [duplicate]

Is there a specific formula where I can compute how many hours before my 12v car battery becomes fully empty when using 100w light bulb only?
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Why small LED or CFL lamps usually has better PF than bigger one?

Some peoples recommend using small LED or CFL lamps in home rather than using big lamps, because they has better Power factor than big lamps, For example if you need 80 W Lamp in your room, it is ...
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How to determine what ballast for fluorescent lights?

I am creating a UV Cleaner, but this is my first time working with fluorescent bulbs and I wanted to make sure I'm doing it correctly. I got the following fluorescent bulbs: GT15T8 Philips UVC Bulb ...
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Troubleshooting a round fluorescent bulb with 4 pins in a square formation?

I purchased a new magnifying desk lamp. It uses a round fluorescent bulb. I plugged it in, turned it on, and it doesn't light up. No buzzing, no lighting, nothing. So, how do I go about testing it ...
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Fluorescent tubes in series?

Is it possible to use fluorescent tubes wired in series, provided that the ballast can supply a high enough voltage and power? Problem description F28T5 are too long (4ft) for me, so instead I plan ...
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2 votes
1 answer
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Voltage in a fluorescent light bulb?

This is sort of a spin off of this question. Fluorscent have a tiny transformer inside them, and a bunch of capacitors, as well as transistors, and diodes. What exactly happens when a light bulb ...
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What makes compact florescent lamp wear out so fast?

I notice that a compact florescent lamps (CFL) wear out faster than its lifetime. My personal experiment was on 15 watt / 220 V / 50-60 Hz / 690 Lumen spiral lamp. Its rated lifetime is 8000 hours (...
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PIR Sensor University Project

I'm working on a project to use PIR sensor to save on electricity bill in a university, almost a fresh graduate in Electronics Eng. Load is Fluorescent tubes 44w each via ballast,there will be ...
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1 answer
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Designing a switch box for lights

I need to build a box with 12 momentary push button switches for 12 separate lighting sources. I plan to plug 12 fluorescent lights into the box, then I'd like to control the lights with the push ...
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3 answers
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What does reverse diode on NPN symbol indicate?

Update: A diode in this position is (at least sometimes) referred to as an anti-parallel diode. This term brings up a lot more results on search. I've been scavenging parts from compact fluorescent (...
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How can I test a ballast circuit without?

I have an old table lamp. I want to repair it. It has an external ballast circuit and 9 watt fluorescent lamp (PL). I don't know the circuit is working or not. Is there any way to check it without ...
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Why does compact fluorescent lamp (CFL) save more energy?

I read information about fluorescent lamp and compact fluorescent lamp (CFL) but I still don't understand why CFL saves energy and produce the same amount of light? Maybe the electronic ballast ...
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2 answers
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Power consumption of a Fluorescent choke

We had 4 x 36W Fluorescent lamps (120cm) in a kitchen. We replaced them with 4 x 18W LED lamps. This was the Fluorescent choke for the old lamps: Question: how much power did the original ...
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1 answer
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How can a fluorescent lamp run without a ballast?

I have a desk lamp which, sometimes when I start it, causes my computer monitor that is connected to the same outlet to turn off and reset, so I disassembled the lamp to see what could cause this to ...
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Arduino with mosfet resets when switching on/off fluorescent lights

I'm working on this project for opening a lot of solenoids and to turn on/off lights. When I'm testing, everything seems fine, but in production, the Arduino resets or even behave strangely by ...
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1 vote
2 answers
556 views

How does fluorescent lamp produce audible sound when blinking?

A fluorescent lamp will often blink near end of its life. Each time it blinks it likely produces a clearly audible sound which is hard to describe but it's something in between a water dip falling ...
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Spectrum precision of fluorescent lamps

How precise are fluorescent lamps when mass produced? Is their emitted spectrum really identical or is it possible to detect a difference between two random lamps using appropriate filters with photo-...
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Capacitor in a fluorescent lamp starter

In the magnetic ballast type fluorescent lamps (old ones),what is the need of a capacitor in the starter circuit and what determines it's ratings? If my understanding is correct its a bi-mettalic ...
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28 votes
4 answers
23k views

Do "blown" fluorescent lights still use electricity?

When a fluorescent light fixture goes out, it often flickers and then after a while stops shining altogether. When this happens and when it finally dies is the circuit broken and does it still use ...
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2 votes
2 answers
758 views

Run 12v Incandescent Bulbs off Fluorescent Ballast

Can I use a 120v AC to 12v AC electronic transformer to power 12v bulbs? I have a 150 watt transformer that I tried connecting to a single 10w incandescent bulb, but the bulb just flickers at a low ...
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Using 6x58W fluorescent lamps instead of 6x55W, what could possibly go wrong? [closed]

I'm planning to buy a fluorescent photography lighting head, but the manufacturer specified it uses 6x55W lamps, but I want to use Philips Graphica 58W lamps. 3 watts more per lamp, doesn't look like ...
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3 votes
1 answer
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Improvized small aquarium lighting

I have a small aquarium that has been illuminated so far by a 15W fluorescent lamp. The problem is that the ballast has broken (melted) after 2 years of use, and the only replacements I could find on ...
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6 votes
1 answer
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What's the difference in fluorescent lamps?

The old tubular fluorescent lamps were 41 mm in diameter. New lamps are only 16 mm. Is there an electrical difference between the old and new? (Image from a Philips ad)
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How to light a fluorescent lamp?

There are a lot of circuits on the internet for lighting fluorescent lamps. But they don't reveal the working mechanism of the lamp itself. I'm more concerned about the theory rather than the ...
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4 votes
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Lighting Fluorescent lamp with plasma ball results in electric shock?

A friend of mine is a teacher and did an experiment in class. She held a fluorescent light next to a plasma ball and it lights up. This seems logical, the electrons flow from the plasma ball through ...
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7 votes
2 answers
9k views

1-10V fluorescent lighting digital control

I have a number of fluorescent lights installed that use 1-10V dimming. Note that this is not the same as 0-10V dimming as used in older theatre equipment. The control gear for the lights outputs 10V ...
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4 votes
1 answer
2k views

Can i use a SSR for switching a fluorescent light?

Can I use a SSR for switching a fluorescent light on or off? Specifically, can the SSR last for a long time, and can it withstand a very large number of on/off switchings? I would also appreciate a ...
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10 votes
2 answers
11k views

Serial capacitors in electronic ballast of a fluorescent lamp

Recently I repaired one broken electronic ballast of a linear 30W fluorescent lamp. Now it seems to be working as expected, but I had to make some changes to it and I'd like to ask if you see any ...
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11 votes
3 answers
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Should I use slow fuse or fast fuse?

When I design something or going to add a fuse to place where fuse isn't used now, should I prefer slow or fast fuse? I understand that this depends on situation, but I'd like to hear what do you ...
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7 votes
3 answers
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How do you dim a streetlight bulb?

I'm getting a streetlight, most likely with a HPS bulb (high-pressure sodium). I'll probably hook up some sort of sensor to turn it on only when someone is actually parking lot. Why do some ...
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6 votes
1 answer
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Compact Fluorescent Lamp Load Calculations

I help build/wire up large illuminated carnival/parade floats, and in the past we have used around 11,000 40w/60w GLS BC light bulbs in festoon sockets, powered by a 800KVA 3 phase diesel generator. ...
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17 votes
2 answers
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Electronic Drivers for Fluorescent Lamps: How is the DC-to-AC Conversion done?

Pretty much all (somewhat inaccurately named) electronic ballasts for fluorescent lamps run off a DC voltage and have to convert it into AC to operate the lamp. The DC supply can come from rectified ...
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