Questions tagged [lighting]

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LED strip lumen calculations

I built a vertical hydroponic farm for lettuce. I used 8W T5 LED fluorescent, but my lettuce did not grow well because the lights were not bright enough. I would like to use horticulture LED lights ...
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-1 votes
1 answer
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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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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 ...
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1 vote
3 answers
123 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 ...
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-1 votes
1 answer
57 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 ...
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3 answers
113 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 ...
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3 answers
84 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) ...
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2 votes
2 answers
61 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 ...
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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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1 answer
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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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1 answer
92 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 ...
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4 answers
113 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 ...
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1 answer
249 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. ...
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-2 votes
3 answers
101 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 ...
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0 votes
1 answer
68 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?...
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37 votes
3 answers
13k 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 ...
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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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1 answer
103 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 ...
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1 vote
1 answer
132 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 ...
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1 answer
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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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0 votes
2 answers
354 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 ...
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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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2 answers
85 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 ...
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2 votes
4 answers
144 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. ...
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0 votes
1 answer
73 views

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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3 votes
0 answers
134 views

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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Estimating total amperage for multiple devices on a 120/208 three phase service

I've been poking at this question for a bit, and while I think I have the answer, I'm not entirely sure. I think I just need a sanity check from all the competing methods from coworkers. Assume I have ...
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0 votes
3 answers
121 views

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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0 votes
3 answers
116 views

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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1 vote
1 answer
49 views

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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1 vote
1 answer
123 views

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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1 vote
2 answers
126 views

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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2 answers
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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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0 votes
0 answers
65 views

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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0 votes
1 answer
213 views

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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0 answers
31 views

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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0 votes
1 answer
81 views

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 votes
2 answers
181 views

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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1 answer
65 views

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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0 votes
1 answer
144 views

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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1 answer
2k views

Why is my 50-600V voltage tester able to detect 3V? [closed]

I used non-contact voltage tester to test burned out Christmas lights. It says it can only detect in the range of 50-600V. One of the strings has 40 bulbs in series and none of the lights are burned ...
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0 answers
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Using an old 2 way switch in 3 way setup

i'm not an expert in electronics and i'm keen to get some guidance on the below... I have an old vintage 1-way (On\Off) light switch I would like to use as a 2-way switch to control a light from two ...
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0 votes
1 answer
57 views

What is meant by lightning dissipates through a vehicle's body?

I have read a lot of articles and other post relating to what happens when lightning strikes a vehicle or evening a building with metal. However, I cannot grasp one part. This is when lighting strikes ...
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1 answer
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Can I wire a security camera into a switched lighting circuit?

I live in a building with a communal stairway. This has lights which are switched on each floor, controlled by a timer box which holds the lights on for 2 minutes after the push button is pressed. I ...
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1 vote
0 answers
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Daisy chaining lights with I2C

I want to make some modular mood lighting. The idea is that there is one master in the chain (the one that gets turned on first) and the other lights can plug in to each other. Each light has a rotary ...
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1 vote
2 answers
368 views

Would connecting multiple light socket splitters together decrease lumens

Sorry if this is a noob question. I'm trying to build a very bright light by combining multiple light bulbs together with socket splitters. My thinking is simply to take three 7 in 1 light socket ...
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0 votes
1 answer
65 views

Will a string of 5W globe bulbs in patio survive the rain? [closed]

I have a string of 5W globe bulbs (G12) in patio. The bulbs are facing upwards. A few questions What will happen if: If I turn them on after it has rained and things are wet I turn them on during ...
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1 vote
1 answer
75 views

Please help me identify this LED from a Nuevo (HGH0242) / Horizon Lighting 5-pendant light fixture

This is an apparently failed LED from a 5-year-old Nuevo (HGH0242) / Horizon Lighting 5-pendant light fixture in my house. Only this one has failed - all others still work. It measures about 11.7 mm ...
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1 vote
2 answers
130 views

Safely wiring two strands of halloween LED string lights in series?

I have ~20 ft of perimeter to cover and it seems everything sold online is sold by ~10 ft lengths. I've decided I want to buy two strands of these lights and connect them start to end. What ...
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1 answer
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Ceiling lamp, 14 gauge, not 18 gauge

I've Googled this very hard, and I'm not coming up with any good answers. This question seems very simple: Are there ceiling lights/lamps in the market that have a 14-gauge wire for the black/white/...
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