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Questions tagged [lighting]

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1answer
49 views

Uneven LED Lighting Wired in Series

I’m struggling with six 11.5-watt LED cans wired in series. With a 75-watt incandescent at the end, the other five seem to function properly, though the incandescent is dull. With an LED in its place, ...
-1
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0answers
56 views

LED bulb drivers, reason why led bulb would not illuminate in relay circuit [closed]

I have a liftmaster circa 2008 garage door opener, two in fact. Incandescent bulb went out on my side. bought 60w LED buld 2 pack from depot for $5 I put new LED bulb in liftmaster, does not ...
0
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2answers
83 views

Soft Touch Lamp Turning on by Itself [closed]

This has been driving me crazy for several years now -- my soft touch lamp has been turning itself on most mornings. Some details: It is definitely tied to sunrise/dawn, as the time each day varies ...
4
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2answers
822 views

Why is one lightbulb in a string illuminated? [closed]

I noticed that in various strings of lights only one was illuminated. It seems implausible that all but one out of several hundred blew. What caused this and why did this particular light turn on?
1
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1answer
37 views

Powering same LED strip from 2 drivers - diode?

So I'm looking at adding some LED mood lighting to our bedroom. End game is to have a single LED strip controlled by 2 different switches Currently, I have 2 switched 240V AC outlets, one either side ...
2
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1answer
46 views

LED selection for my application

I need to select LED/LEDs for a light source in my project. The requirement is that the light source should approximately be able to project light beam of 1.5m diameter on a surface, from a distance ...
1
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3answers
130 views

Off grid LED solar lighting without batteries

I have 2 COB LEDs (12-14V DC, 50W, I think with 3,75 A in data sheet). I need to run them with a solar panel, it should only run when there is sunlight no batteries needed. Using a 270W panel (open ...
0
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1answer
48 views

Trouble getting AL8861 LED Driver to illuminate LEDs

I am trying to get a AL8861 LED driver hooked up. Right now I've connected it to a single LED (this one) to test (see circuit below). I eventually intend to connect it to a DAC5578 Digital to Analog ...
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0answers
48 views

LED Light changes color on being turned on/off simultaneously

What type of circuitry/driver is present in the lights that change color on being turned on/off ? I have a LED tube light which cycles through 3 modes (i.e. color 1, color 2, both color). Its circuit ...
0
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1answer
112 views

Two lights, two switches… one problem!

I'm looking to set up an AC 240-volt lighting circuit consisting of two lights (let's call them L1 and L2), a standard switch (SW1) and a PIR. The goal is to have SW1 turn on only L1, but if the PIR ...
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0answers
35 views

0-10v Lighting Control Test Rig for Lighting Control Systems - How to source 10vdc at 2mA?

If this has been asked previously, I have not yet found it. I've never posted here, so please accept my apologies in advance if this post isn't appropriately written. I'm building a test rig for ...
0
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1answer
56 views

How to calculate the Short Circuit current of a small DC circuit?

I need to do a short circuit test for my DALI slave device. I have observed a maximum load of 140W at 210V-rms (Load current = 650 mA , PF = 0.975). I have to do a short circuit at the load side and I ...
2
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2answers
108 views

Why a CFL lights up when I touch it?

When there is a very low voltage (AC), even for a compact fluorescent lamp (CFL), it glows very dim (orangish in color) at the beginning of the glass but when I hold the glass just for a second, it ...
0
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0answers
89 views

Bare LED light flickering on constant voltage pover supply

I have this LED light which started blinking under some use. So, I desoldered the SMD LED component and hooked it up to a variable power supply. When I apply 6V, the LED starts to emit a little bit of ...
0
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1answer
37 views

Magnetic ballast with g23 bulb with capacitor

I am trying to make a UV-b photo-therapy light and want to make sure I'm understanding the circuitry correctly-so i don't hastily burn a $50 bulb. Im using a Phillips PL-S 9W/01/2P (link here). It's ...
1
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2answers
74 views

compact fluorescent lamp noise on digital signals

The answers to this question about CFLs (compact fluorescent lights) in an electronics lab indicate there is some concern about the presence of electronic ballasts and CFLs in connection to radio and ...
0
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1answer
69 views

24V - 48V standard for lab. tips

I'm new to home improvement. Here's my question. I've got several led strips for ~24V each and I've formulated a circuits to make them work from a 48V outlet at a lab psu. Approx. 16 ampere ...
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0answers
121 views

Autofeel light bar mod [duplicate]

I purchased an Autofeel 30 inch light bar that has 4 rows of LEDs. I have seen this bar advertised under a number of different names, but as far as I know it's the only one with 4 rows of LEDs (they ...
-2
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1answer
62 views

Light bulb and battery

I have a question about a project I am working on. I am making a spotlight and the battery I have is an 18650 battery rated for 3.7 volts and 2000 mah. The light bulb is 1000 watts. My question is: ...
0
votes
1answer
54 views

High(er) Current AC Flasher Circuit

I'm trying to develop a flasher circuit for an aircraft warning light like the one shown at https://flightlight.com/products/obstruction-lights-controls-faa-l-810/. The light will be powered with ...
0
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2answers
97 views

1-wire fairy lights

I have here some fairly lights. It's a string of coloured LEDs with a transformer and control box at one end. The control box lets you select a bazillion different lighting patterns. (Presumably the ...
3
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1answer
86 views

Choosing the right transformer to replace batteries?

I have an idea for a hack I'd like to build, but I need some help figuring out the right transformer. Let me know if there's a better place to post this sort of request. I have some exterior LED path ...
0
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1answer
55 views

Wiring 2 separate PIR’s to an LED Floodlight

If possible can someone please confirm that this would work? I want to place a waterproof box on the front of the house, next to this I will put an LED floodlight (without PIR), I then want to put 1 ...
6
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2answers
308 views

Philips 9 W luminaire quotes 7 A for 300 ms inrush!

In his answer to Will repeatedly turning a light bulb on and off damage it? @Bradicul stated, An example of inrush current is an LED downlight fitting with 9 W (0.0375 A at 240 V) will have any ...
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2answers
189 views

Strange behavior of the DALI controlled luminaires

I faced a strange behavior of a DALI controlled LED luminaires circuit. I have 48 LED luimianires with a MeanWell ELG150-C700-DA drivers connaected according to the scheme below: I commissioned the ...
1
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1answer
64 views

Lightning protection for Antenna Connector

I want to add lightning and ESD protection for the antenna used with my PCB (Wireless Gateway). The antennas that will be used with my PCB are Pole Mount Antenna. There are three different types of ...
1
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2answers
76 views

Relay switching a light causes a spike, making a raspberry pi halt

The problem in short: I worry that switching lights is causing a spike. Occasionally a Raspberry Pi halts completely after a relay is switched. The setup: A Raspberry Pi 3 is connected to an ...
1
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1answer
71 views

Determining the number of lighting fixtures

This may be more of a common sense question but I would like to expand my horizons on the subject. My research tells me that lumens = surface area x foot-candles. So if I am lighting up a 50' x 50' ...
0
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1answer
31 views

HID Lamp Ballast Using TI UCC2305

I am trying to control an OSRAM XENARC 66140 35W HID (High-intensity discharge) Lamp with a circuit which contains Texas Instruments UCC2305. I have obtained 4 original lamps from OSRAM and tried on ...
0
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1answer
433 views

To use a Dual Voltage Electric LED Bulb E26 in a E27 environment/ socket?

To use a Dual Voltage Electric LED Bulb E26 in a E27 or B22 environment? So I bought a Universal LED Bulb that emulates Circadian Rhythm for lighting to help manage my sleep cycles, locally (wherever ...
0
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0answers
352 views

Connecting Protective Earth (PE) to DC ground

This question has a bit of application background so please bear with me: I'm working on a LED lighting system. The controller (MCU, led drivers and led supply) will be powered by a single DC ...
1
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3answers
4k views

Understanding 3 phase 480V lighting circuit

I understand that you would use 480V light fixtures as opposed to 277V because the 480V have a lower current draw, resulting in a more efficient system. What I don't understand is how this circuit ...
5
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2answers
777 views

Precision mini winch (with position feedback) for kinetic lighting?

I am trying to create a kinetic lighting installation for my home, above the dining table (see example here https://www.youtube.com/watch?v=-DZ18DNbjTQ ). Obviously I will use max around 20 lights. ...
0
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2answers
82 views

Dimmer buzzing, lights flickering [closed]

Got an issue with my lights and a dimmer. I got a room with 4 lights in it (6W LED panel lights) and a 60-600W dimmer. Somewhy, the lights from time to time flicker and the dimmer is buzzing all the ...
5
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2answers
2k views

What is the theoretical limit of lumen/watt for lighting systems?

Nowadays we see LEDs with 300 lumen per watt luminous efficacy. They still waste a lot of power as heat. Now what is the limit of electricity to light conversion? Say we build an LED with 100% ...
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2answers
75 views

DC ring mains for lighting, revisited

Traditionally ring mains for lighting have been (relatively) low current AC mains typically at 110/230VAC. It makes sense these days to replace that with lower power, lower voltage wiring to more ...
0
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2answers
960 views

How to calculate the energy output (in Joules) from an LED

I need to emit 20J over 5ms onto a target area of 962mm^2 from an LED source. The source as well as the target will reside in a completely encapsulated environment with reflective internal walls such ...
0
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1answer
251 views

PWM dimmed led floor lamp: can it cause eye strain? [closed]

I have a floor lamp (standing lamp which spreads light via the ceiling). It uses LEDs and it's dimmable. When I capture the light with a camera I can clearly see oscillations. It is known that PWM-...
0
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0answers
40 views

WEMO switch and Sodium lighting

Why can't the WEMO switch from Belkin be used with sodium discharge lights? I am investigating the purchase of a switch to remote control some driveway lights which I believe are sodium discharge ...
0
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3answers
958 views

DALI Communication: Is DALI protocol a byte transfer mechanism or packet layer mechanism?

As per the DALI light-control standard protocol, DALI bus communication uses Asynchronous half-duplex(two-wire) serial communication. It uses Manchester coding at 1200 bits per second(baud). A DALI ...
4
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2answers
1k views

Rewiring USB LED lights to directly use a 5V DC-DC Converter

I'm currently helping a friend who is renovating a VW camper to fit some LED lighting as she has no electrical experience. She has a 10 metre set of LED fairy lights that are powered via USB (bigclive ...
1
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1answer
745 views

Best Lamp Dimming Circuit? [closed]

What's the best way to dim a lamp, and why? Also, which method is typically used in most typical residential dimmers? I originally thought it was as simple as wiring a potentiometer between the source ...
3
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3answers
2k views

Is 12V or 240V more efficient for a domestic solar powered lighting circuit?

I'm about to buy a house with an existing solar system, with 12V batteries and a 240V inverter driving the mains and lighting. I will be installing new smart lights throughout. My question is, should ...
0
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1answer
206 views

Dimming A/C Lighting by Microcontroller

I have a question regarding A/C lighting for IoT just basically where to go for the information/parts I need. I want to control the lighting in my bedroom/bathroom via IoT devices that will act as a ...
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2answers
65 views

LED spotlights in soffits [closed]

I am looking into buying some 5W LED 3000k GU10 spotlights with a rating of 450 lumens, for my gypsum soffits. The only part which is confusing me is what viewing angle I should get. I have found a ...
1
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1answer
1k views

How can you make a light source brighter?

I am about to begin to work on an electronics project that involves the output of red light. After playing around with a bunch of LED’s, I realize that red and yellow are the weakest as far as “...
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2answers
54 views

Exposed bulb/wiring project [closed]

Apologies if this is the wrong exchange. I would like to start a home project, in which screw-in bulbs are left mostly exposed, and connected to semi-flexible wire. Something similar to this: A ...
0
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2answers
45 views

timed lighting button working principle

In the building I live, the hallway lights can be turned on by pressing any button that are scattered around the building, and all the lights will go on for a given time. I'm pretty sure that its ...
2
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3answers
5k views

Wiring a bunch of micro LED fairy lights to a single power source in parallel

I want to create a cascade effect using the wire fairy lights, like in this photo . What would I need to accomplish this? I can find the coils of lights for cheap online that use battery packs, but ...
1
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1answer
102 views

Basic electric/wiring questions resources

I have a 12V DC motor that I want to power alongside a 40 Watt incandescent bulb (I might find an LED bulb that works aesthetically).  I need to run a single cord to power both.  Preferably with a ...