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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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5answers
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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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1answer
54 views

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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1answer
14k views

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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1answer
263 views

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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1answer
86 views

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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1answer
1k views

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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1answer
2k views

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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1answer
733 views

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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1answer
50 views

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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1answer
94 views

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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1answer
127 views

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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3answers
1k views

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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1answer
220 views

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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2answers
138 views

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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2answers
7k views

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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1answer
6k views

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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1answer
585 views

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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2answers
315 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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2answers
72 views

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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2answers
28k views

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 ...
28
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4answers
18k 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 ...
2
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2answers
647 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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1answer
105 views

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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1answer
284 views

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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1answer
157 views

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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3answers
2k views

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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2answers
1k views

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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2answers
8k 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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1answer
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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2answers
9k 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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3answers
11k views

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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3answers
3k views

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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1answer
1k views

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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2answers
8k views

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 ...