Questions tagged [lighting]
The lighting tag has no usage guidance.
172
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Earth to live I am reading 140 volts and neutral to live I am reading full 230 volts [duplicate]
When measuring from earth to live I don't get the full voltage as expected. I suspect this is a problem with the earth wire. Maybe it is disconnected. If it is disconnected, how can it read 140 volts ...
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1
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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 ...
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3
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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 ...
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1
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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 ...
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2
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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 ...
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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 ...
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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 ...
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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 ...
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1
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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,...
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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 ...
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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 ...
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2
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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
...
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1
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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 ...
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4
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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 ...
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3
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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 ...
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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 ...
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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 ...
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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)
...
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2
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2
answers
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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 ...
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2
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0
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385
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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 ...
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482
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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 ...
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381
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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 ...
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4
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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 ...
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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. ...
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3
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140
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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 ...
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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?...
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3
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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4
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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.
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Looking for pictures that compare color temperatures of various LED light strip technologies [closed]
I'm curious about how well an RGBA LED light strip can render white light (various color temperatures), compared to RGB, RGBW and RGBWW light strips. I'd like to find some pics that demonstrate that.
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Why does my lamp say "Use max 60 watt Type A OR max 10 watt LED?"
I'm really intrigued by the label on a new lamp. It says:
Caution: To reduce the risk of fire, use MAX 60 watt type A lamp OR use MAX 10 watt self-ballasted LED lamp or lamp adapter.
Now I didn't ...
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Identifying risks working with motorcycle wiring
I recently bought some light accessories to add to my motorcycle in order to increase visibility and safety. I was planning to have a motorcycle shop install them, I usually am willing to DIY things ...
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3
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Is this component safe to bypass?
I have a 1950s low-voltage lighting system, as described in this question, and while tearing out the wires in the basement, I somehow disabled the entire system. By trial and error, I discovered that ...
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What are the negative effects of running only series LEDs on a constant current driver?
I have torn down a cheap light fixture and am trying to understand the design tradeoffs involved with this low quality device. There are only two components in the light fixture:
A constant current ...
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Dollhouse lighting using SMD lights with CR2032 (how to bias an LED array)
I am a complete novice, so please be gentle.
I make 1:24 scale tiny dollhouses. So far I have powered them using 2x CR2032 batteries and 2 or 3 SMD (0402) warm white bulbs.
Usually the lights are just ...
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Trying to replace LEDs in lighting fixture - new LEDs just blink
A friend and I - both electronics hobbyists - figured replacing the blown LEDs in his home exterior lighting fixtures couldn't be THAT hard... (pause for all to say 'yeah, it's not straightforward you ...
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Need help with configuration of a touch sensing lamp project! [closed]
I am currently a design student in university, and am attempting to configure a large scale project for my final. The idea is that there would be a lamp, with one person holding onto either (wire? ...
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Quick simple car lighting circuit question
I have wired up the below circuit in my car and would just like to ask if there are any issues with this circuit.
The lighting in this circuit is tapped into three wires from the car's ceiling light. ...
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Retrieving energy data from dali2 D4i memory bank (202) of a luminare
I'm trying to read the memory bank202 from a DALI-2 supported led luminary for energy consumption.
it returns a value of zero. when i gone through the Dali part 252 energy reporting Doc. It asked me ...
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Can a solar cell based lux meter produce useful readings for ultraviolet light?
I was reading the question Safety Guidelines for Ultraviolet LEDs? about ultraviolet exposure, and realized that a solar cell can probably detect this, since solar cells can also detect visible light, ...
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230V Light switch to control intensity and drive two bulbs
I'm looking a way to improve a lighting solution.
The idea :
to use a basic electrical switch already present in my room wall (with Line switched by the toggle switch + Neutral not switched) to ...
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2
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Wire ebike lights to main battery
I am newbe to this Forum and to ebike enthousiasm.
Sorry, my english is minimal.
I need to add front and back lights to my new E6100 Series Shimano STEPS driven ebike.
I opted for lighting directly ...
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How to connect a mains 24Vdc and an Emergency 24Vdc supply to lights that should switch the mains supply off when the emergency feed is switched on
I am looking for a solution for some lighting that was installed recently. The lights are single LED downlights that are connected from a direct connection to 24Vdc through a constant current driver ...
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How can there be voltage across resistors in series when circuit is open?
If you have a circuit containing 5 resistors, and one of them gets damaged such that current can't flow through it, I assumed no current would flow anywhere throughout the circuit, and that the ...
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