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Questions tagged [lighting]

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0
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1answer
34 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 ...
0
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0answers
39 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
107 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 ...
0
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0answers
29 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
53 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
100 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 ...
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0answers
84 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
27 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 ...
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2answers
70 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
68 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
34 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 ...
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1answer
61 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
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1answer
39 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
79 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
61 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
26 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
274 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 ...
0
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2answers
126 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
55 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
62 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
68 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
28 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
335 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 ...
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0answers
231 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 ...
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3answers
2k 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
578 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
71 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
1k 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% ...
0
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2answers
73 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
712 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
229 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
37 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
807 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
827 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
664 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
1k 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
184 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 ...
-3
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2answers
64 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
vote
1answer
869 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 “...
0
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2answers
53 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
44 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
4k 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 ...
0
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1answer
90 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 ...
0
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1answer
84 views

Powering a low voltage device from a two wire light circuit

I am about to embark on a home automation project, but I'm having trouble finding Wifi based IoT devices which can be powered from a standard two wire light circuit. The idea is to replace light ...
0
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2answers
56 views

How long will the batteries last when hooked up to this light?

The light being used is here: https://www.amazon.com/Germicidal-254nm-U-shape-150mm-Purification/dp/B01CV2W12E Lamp Current: 5.0mA Wattage: 8 watts It will be hooked up to 2 AA batteries in ...
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0answers
81 views

Filament and brightness confusion

So I've been reading mixed explanations on the following questions I've been pondering: Does a brighter (incandescent) bulb use thinner more resistance filament or a larger less resistance one? Which ...
2
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1answer
216 views

How can we power Christmas LED lights without mains supply

I have read the other thread 'Best way to power Christmas lights without nearby outlet' and my question does differ. We have a Christmas Tree which sits in the middle of our Village Green every year. ...
0
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0answers
449 views

4 bulb Ballast only lighting 2 bulbs

I have a six T8 Fluorescent light fixture. The 2 inner bulbs are powered by a 2 bulb ballast GE232-120RES-DIY, and the 4 outer bulbs, 2 on each side are powered by a 4 bulb ballast GE432-120RES-DIY. 2 ...
0
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1answer
396 views

Power Factor Correction Circuit (LED lighting)

I've been researching how to design power factor correction into an agricultural LED lighting system. My client requires at least a 0.95 power factor. I'm planning to use PWM controlled buck ...
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4answers
4k views

Are LEDs in modern streetlights usually pulsed? If so, roughly what frequency?

I can think of some reasons why modern LED streetlights would likely be pulsed; Efficient voltage conversion starting from line voltage would likely include an AC or switching step higher than 60 Hz....