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Questions tagged [lighting]

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Is it dangerous to have no cover on a fluorescent tube (bathroom light)? [closed]

Is it dangerous to have no cover on a fluorescent tube (bathroom light)? I have a bathroom light above my sink with two fluorescent tubes. The acrylic cover sheet that slots into the fixture is "...
Jocelyn Yeoman's user avatar
1 vote
1 answer
32 views

Light steady strobe from broken white lights [closed]

When I drive around town, I see white lights steadily flashing when they are broken. Around 1 Hz or maybe up to 5 Hz; different lights at different frequencies. Back in the day, I don't remember ...
Alex's user avatar
  • 143
0 votes
0 answers
27 views

Convert a dry cell circuit to work with li-ion module

I find an emergency lamp circuit,this circuit works with dry cells but I have li-ion battery and tp4056 li-ion controller module. As you can see, its inputs and outputs are on different pins. How can ...
Muhammet Kır's user avatar
1 vote
1 answer
76 views

How do phosphorescent panels compare to LEDs for whole of night low level lightinhg

Modern phosphorescent materials are used for applications like emergency exit signs and evacuation markers. I'm wondering if the best of these may be acceptable for low level all night low level ...
Russell McMahon's user avatar
  • 151k
0 votes
1 answer
98 views

Optimizing Incandescent Traffic Light Design

I'm currently working on designing an incandescent traffic light system and could use some guidance on extending and optimizing my design. Initially, I've successfully implemented the required ...
Zipho Lunika's user avatar
2 votes
1 answer
112 views

What is causing half of my Christmas tree lights to go out? [closed]

I have two strands of well used Christmas tree lights with incandescent bulbs. One is red and white, the other is multicolor. Both of these strands are only illuminating half of the bulbs in the ...
Chris Fernandez's user avatar
0 votes
1 answer
17 views

Adding PPF/PPFD / Scaling

When considering PPF or PPFD, can you multiply the PPF of the light source by a factor (for example x100) and divide the calculated PPFD value by it to obtain the same results? In another way - is PPF ...
Ocean's user avatar
  • 1
2 votes
1 answer
441 views

Airport runway lighting: What is constant current in relation to alternating and direct current?

I’m an apprentice electrician currently replacing runway lights and pulling new wire at a small international airport. When I asked I was told they are 5kV direct current. Okay… simple enough. What ...
Incompetent Jim 's user avatar
2 votes
0 answers
632 views

"2.4GHz RF" used in some LED lighting products: what protocol is it?

There are a number of LED light control devices about, which boast a "2.4G RF" wireless protocl, which is neither WiFi, Zigbee, nor anything else. I was wondering if someone could shed some ...
polemon's user avatar
  • 1,097
2 votes
3 answers
147 views

AC to DC LED driver - help to determine fault or suitable replacement [closed]

Our home's exterior landscape lighting is powered by a transformer that outputs 12V AC. I have two (expensive) LED landscape lights and one of them isn't lighting up anymore. I opened it up and found ...
blaydes99's user avatar
0 votes
2 answers
716 views

I am trying to DIY outdoor gazebo solar lights

Im no electrical engineer. Just a bored ADHD mum trying to make her home nice and eco friendly. So we just set up a gazebo tent un our courtyard and it gets really dark at night. We dont have any ...
Sophia Castaneda's user avatar
0 votes
1 answer
156 views

Aluminium PCB - Bottom Entry Connector

Is there something like this connector that is easier to buy? I need to find something that lets me connect an aluminium PCB to an FR4 PCB with part of the enclosure between them. The part of this ...
Dan's user avatar
  • 133
1 vote
2 answers
107 views

RGB LED Selection and Perceived Brightness

I'm trying to design a smart light with 800-1000 lm white LED strings (warm+cool) and RGB, but I'm having a hard time comparing the luminous intensity or sometimes mcd ratings. How can I select red, ...
Dan's user avatar
  • 133
15 votes
3 answers
3k views

Where is the LED in this light bulb?

This light bulb is classified by its manufacturer in Europe as a Classic A 7W 230V 2700K 806lm B22d bulb. To me this bulb has the appearance of an incandescent light bulb with thin filaments of yellow/...
Excel r 8's user avatar
  • 261
0 votes
2 answers
52 views

Case-less Power Triac Part Number Identification

I am trying to identify the part number of this high current (20A) triac. It was originally covered in potting, and it appears to have four pins (2 power, 2 control). It would appear to be something ...
Chris Puglia's user avatar
1 vote
1 answer
500 views

DALI 209 DT8 RGB color commands

I know how to send DALI comands to change the temperature. It is done by sending to following commands: ...
Maximilian's user avatar
0 votes
1 answer
46 views

Will installing two GU10 light bulbs into 2G10 base work? [closed]

I have a 2G10 lamp base mounted into the wall with a 2G10 bulb, I want to connect it to my smart home. Will anything go wrong if I plug in two GU10 bulbs into it? Will they even fit? Didn't find much ...
Ilya Kuleshov's user avatar
1 vote
3 answers
3k views

Is it safe to slightly unscrew a light bulb so it doesn't complete the circuit? [closed]

It's dangerous to leave an open socket, but I have a light fixture that's too bright and I don't have a dead bulb to put in one of the sockets. Is it safe to put a bulb in but unscrewed enough that it ...
bdavidson's user avatar
0 votes
1 answer
99 views

How to have 5 or 6 access points in this lighting circuit?

In the diagram below, if I wanted to have access from only 3 different points, what changes would I need to make? In the diagram I have 4 access points. What if I wanted 5 or 6 access points? Image ...
Scipio's user avatar
  • 803
0 votes
2 answers
74 views

Power rating and operating voltage

What does it mean when a lightbulb is rated at 60W with 220V? My understanding is that the input power to the lightbulb will be 60W. But what about 220V? Is it the amount of voltage the lightbulb ...
20MikeMike's user avatar
2 votes
1 answer
3k views

Lighting LEDs: What does 3-Step or 5-Step MacAdam ellipse mean

While searching for lighting LEDs in the range of 3500K to 5000K, I see results that show 4000K or 5000K alone, and some results that show 5000K 5-Step MacAdam Ellipse (well, all four combinations of ...
Cal-linux's user avatar
  • 2,143
0 votes
2 answers
453 views

Outdoor low-voltage 12 V landscape lighting systems: transformer vs SMPS

Why are 12 V transformers so popular for outdoor low-voltage landscape lighting systems vs using a 12 V switch-mode power supply? From my understanding, a switch-mode power supply is smaller, more ...
furthermore's user avatar
6 votes
1 answer
222 views

Is the output of a 12V DC driver different depending on forward or reverse phase AC input?

Does the output of a 120 volt AC to 12 volt DC LED driver differ depending on whether it receives forward-phase AC input or reverse-phase AC input from a dimmer? I’m curious because I have some LED ...
Edward Ocampo-Gooding's user avatar
0 votes
1 answer
269 views

AC live wire parallel circuit. How does electricity flow?

Suppose you have an AC circuit and you connect a light "in parallel" on the live wire. Essentially a loop on the live wire. How does electricity flow in such circuit? The light would turn on,...
lexotero's user avatar
0 votes
0 answers
38 views

Inline dimming circuit fed from dimmable lighting controller

I have an industrial dimmable lighting controller (240VAC, 50Hz) which has one output going to a splitter cable with multiple connectors, where many dimmable LED tubes can be connected. I would like ...
weblar83's user avatar
  • 101
2 votes
1 answer
85 views

Using truck 12 V power to trigger lights on trailer

I have a ute (Australia, so truck to the Americans in here) and a car trailer. I have a 4 LED lights on the trailer wired to a relay which is powered by, and earthed directly to, the trailer-mounted ...
Malachi McMurtrie's user avatar
2 votes
2 answers
478 views

What would happen if a superconducting power line were hit by lightning?

I recently read an article on EETimes, discussing superconducting power lines to increase transmission efficiency by 5-10% due to nearly zero ohmic resistance. They state that normal power lines ...
Jonas's user avatar
  • 107
-1 votes
1 answer
123 views

DALI DAPC Control not working [closed]

I am using Osram constant current LED power supply to dimm led lights using DALI. I have functional program with dimming using DALI DAPC commands. Dimming in range 100-255 is okay and works as it ...
tmajz's user avatar
  • 3
11 votes
4 answers
1k views

Powering and dimming a few hundred light bulbs

I want to power a very large light fixture: it has 273 G4 socket light bulbs. The bulbs I found for the thing are 12 V 5 W ones, incandescent. So the question is how to power the beast (as it is 1365 ...
A. Daty's user avatar
  • 113
1 vote
3 answers
893 views

Why are metal halide bulbs always ~130V?

I noticed that - even though the local voltage is 240V - metal halide bulbs are always sold as 130V bulbs, and their product sheets list the maximum voltage as 130V. Do perhaps all flood lights that ...
Roel Van de Paar's user avatar
0 votes
0 answers
73 views

Is there anything to limit LED output dimming 50% while the wall dimmer controls 50% to 0%?

We got a project for a client but our lights are too bright for the space, we still want to sell the the lights because we have extra inventory and need a way to dim the LED output to 25W instead of ...
VV1993's user avatar
  • 11
0 votes
3 answers
169 views

Designing driving LED circuit with electricity consumption in mind

I have a question about driving LED in different, inverted way: the LED should light on when the signal/state is LOW (0V) and the same LED should be turned off when the signal is HIGH (5V). I have ...
Karlsson's user avatar
  • 113
0 votes
3 answers
1k views

AC LED driving circuit - How to drive low voltage LEDs?

I've been tearing down LED light bulb to see how they were driven and found out that most of them use this very simple circuit: This is my understanding of the circuit: 220V AC Input (I'm un Europe) ...
coriv's user avatar
  • 81
2 votes
2 answers
153 views

Custom LED light bulb protection /

I wanted to design a custom LED light bulb, so I bought a couple and tore them down in the hope to reverse engineer them. Most of them implement a circuit with a chip shown as below, with the circuit ...
coriv's user avatar
  • 81
3 votes
0 answers
651 views

Home automation using CAN bus

I am planning to make a prototype for wired home automation devices, and I am thinking of using CAN bus for communication between nodes and Gateway. The way I am planning to build it, there is one ...
awakrim's user avatar
  • 31
0 votes
1 answer
1k views

DALI - DT8 - CCT Control command

I made the below code for setting CCT in DALI DT8 drivers as per the discussion on DALI 209 - Device Type 8 - CCT control and DALI DT6-DT8 Sending commands above 255 The DTR setting is working ...
Shanuver Isniyakh TV's user avatar
0 votes
1 answer
1k views

DALI DT6-DT8 Sending commands above 255

From my understanding and research, each DALI command consists of 2 8 bit parts one for addressing and one for the commands which are sent one by one, but there are commands above 255 which are more ...
Shanuver Isniyakh TV's user avatar
0 votes
4 answers
500 views

Why do almost all DALI master circuits calls for using an interrupt pin for RX?

I was searching for the DALI communication part for Dali Master Design and almost all designs use opto isolation circuits (which vary differently in components) and use MCU interrupt pin for DALI ...
Shanuver Isniyakh TV's user avatar
1 vote
1 answer
2k views

DALI 209 - Device Type 8 - CCT control

I am new to DALI lighting control. trying to develop atmega based master controller especially for device type 8 (DT8). my main goal is color temperature adjustment. I am going through IEC 62386-209. ...
Shanuver Isniyakh TV's user avatar
-2 votes
3 answers
971 views

Why do car blinkers seem to synchronize and then diverse from each other?

When I am on the road, the blinkers of other cars seem to sync together for a few clicks and then they diverse again. Is this just me seeing it wrong - so on fact they never sync - or is there some ...
Asmodean's user avatar
0 votes
1 answer
883 views

Wall plug to usb?

I’m sure this is not the brightest question. (You’ll see my pun in a minute.) I want to purchase standard plug in strings of LED lights and connect them to USB power banks for events. Is this possible?...
Amy Davis's user avatar
41 votes
3 answers
49k views

Why does this LED bulb have an energy efficiency rating of 'F'?

In my home, I have some halogen spot lights, which have an energy efficiency rating of 'C': I would like to replace them with more efficient LED bulbs, but looking on the Philips website, they claim ...
Rocketmagnet's user avatar
  • 27.5k
0 votes
1 answer
107 views

Could anybody help identify this connector?

Would any of you recognize the following connector ? It's on a old Dell laptop motherboard (M3800). It's to connect the led circuit from the lit keyboard. The flat brown cable from the lit keyboard ...
Stéphane Lieben's user avatar
0 votes
1 answer
590 views

DALI DT8 tunable white control - novice in need of help!

Completely new to DALI, and I need to control a tunable white luminaire. I have a Hasseb USB to DALI interface (http://www.hasseb.fi/shop2/index.php?route=product/product&product_id=50), which ...
Frederik Hansen's user avatar
1 vote
1 answer
148 views

Are there non-unscrewable microwave oven bulbs? [closed]

I recently emptied a Samsung microwave oven of its components and came across the lightbulb, which appeared at first glance to be fitted in a diamond shaped holder. Though when I looked through the ...
Andreas's user avatar
  • 190
0 votes
1 answer
188 views

Phase cut dimming driver for panel lights having occasional flick

I am designing a phase-cut dimming driver for Incandescent bulbs as well as LED panel lights with dimmable drivers. Using a BTA24 Triac and VOT8121AB Optocoupler driven by my MCU. For zero-cross ...
Daga Arihant's user avatar
0 votes
2 answers
3k views

Current draw of an Arc Lighter

I have an arc lighter, similar to that which you can see here: My question is this. I understand that you need a very high voltage, created by a transformer within the device, to create sufficient ...
Nick Cory's user avatar
0 votes
0 answers
129 views

Connecting 2 positive leads from the same car battery to a light

I just installed some small daytime running LEDs (LED lights used) which also acts as an animated turn signal when the original signal is blinking. The positive lead that is attached to power the ...
Aaron Olin's user avatar
0 votes
3 answers
817 views

How to make a custom LED backlight

I would like to make one of these edge-lit LED backlights, with a custom shape: Although I have tried searching, I can't seem to find exactly what materials it's made from. Are these just a sheet of ...
Rocketmagnet's user avatar
  • 27.5k
2 votes
4 answers
577 views

Is the luminous efficiency of a 5000 K incandescent greater than that of a 3000 K bulb?

The color temperature represents the color of light emitting from an ideal black body, when heated to said temperature in kelvin, and how an incandescent bulb emits light is close to a black body. ...
AlienBoy's user avatar