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Questions tagged [lighting]

The tag has no usage guidance.

0
votes
1answer
101 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
votes
2answers
59 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 ...
2
votes
1answer
239 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
votes
0answers
575 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
votes
1answer
444 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 ...
10
votes
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....
0
votes
1answer
340 views

Requirements for dimmable LED driver

I bought a new LED aquarium light and the driver that came with it is not working. I want to buy a replacement driver but I need a better understanding of the driver requirements before I can make an ...
0
votes
3answers
16k views

Full Spectrum LED(400nm~840nm) vs Grow Light LED (RED+BLUE)

I'm planning to buy lights for my planted aquarium tank. After a small research I found that regular lights are not suited for growing plants. Beacuse they need BLUE for Leaf Growth and RED for Stem ...
0
votes
2answers
327 views

Does color rendering index increase with brightness?

I've been reading about LED strips and thinking about switching to those from my serial incandescent lamp setup, and I can't figure out if CRI (color rendering index) is tied to a certain standard ...
0
votes
2answers
219 views

Power Distribution to Greenhouse LED Lighting

I'm working on designing a custom LED lighting control system for an agricultural research project. This involves supplying significant amperage to high power LEDs distributed over a wide area (e.g. ...
1
vote
5answers
5k views

LED lights wired in Series will not light

I have a pack of simple LED lights that I planned on wiring in my boat for cabin lights. I installed and wired them all in a simple series circuit. Power supply connected to switch, switch connected ...
0
votes
1answer
61 views

LED bulbs or LED downlight? [closed]

Correct me if I'm​ posting this in the wrong sub. I've never really played with LED lighting, but I've seen there are two types, bulbs and down lights. While the bulb type is more common as most of us ...
1
vote
1answer
198 views

Big picture: Ceiling LED control [closed]

I have been looking at ceiling LEDs for a while; I am owner-building a house ATM, and "wondered" how I can control the ceiling LEDs -- most 9-12W, probably 30-ish of them; in 3-4 different zones. ...
1
vote
1answer
98 views

Street Lighting Circuit Analysis

1- How does a typical street lighting circuit look like? (for 230V/50Hz, with details) 2- Without having the network plans or knowing anything about the topology of the circuit, is it possible to map ...
3
votes
2answers
169 views

Multiple lights with button that turns one on at a time [closed]

I am an artist trying to make an installation but I'm not too familiar with electrical work. I want to have multiple light bulbs wired to one button. Each time the button is pushed one light bulb ...
0
votes
0answers
75 views

Does a 20W bulb “overdrive” this transformer?

My daughter's IKEA reading light has/had a 12V 20W bulb with a transformer that listed that it output "11.5V ~ 10-20W 60Hz". The transformer stopped working, and I can't find a replacement available ...
3
votes
3answers
2k views

How Is Intensity of Blue Light Measured?

As a hobby project and to help solve issues getting up early in the morning (specially given that it's winter and the sun isn't up until long after I am) I'm trying to find a bright blue light that I ...
0
votes
2answers
585 views

How to vary DC (0-450mA) current using Arduino output voltage(0-5 v DC)? [closed]

I want to vary output DC current(0-450mA) Of LED driver keeping voltage constant using arduino output voltage (0-5 Volt) is there any IC or current regulator operated on arduino (0-5 volt )i.e at ...
2
votes
2answers
472 views

Strange light bulb phenomenon

Let me explain. My son has a small typical night light that occasionally will go out, even if the bulb isn't dead. Usually I'll tap on it repetitively or shake it to get it to work again. When I ...
-1
votes
1answer
130 views

12v low power, high brightness solution - urgent

I need to quickly come up with a way of lighting a trade show booth from a 12v marine battery for 8 hours. My original idea to light the booth was to use a power inverter hooked up to an 80Ah battery ...
2
votes
2answers
182 views

LED lighting that lasts longer than me [closed]

My research has indicated that failure in LED lighting (incandescent replacements) results from failure in the support components rather than the actual LEDS themselves. How can I build and/or modify ...
1
vote
1answer
103 views

What are typical track lighting track profiles used in Europe?

In the U.S., the typical track lighting track profiles are known as "H", "J" and "L". Their cross-sections can be easily found by googling them. Are these same cross-sections used in Europe? If not, ...
0
votes
2answers
288 views

Making a 5v 12v and -12v PSU [closed]

I'm trying to make a PSU for a Zero88 Juggler lighting desk (as ours has been misplaced and a new one is £70) and am struggling to find a transformer to be able to power it. The pin out on the back of ...
1
vote
2answers
1k views

Car interior light with multiple “triggers” - 12V DC power

trying to add some lighting in the foot wells and under the seats in my car so that when someone drops something down there in the dark, it's not something that (at least not every time) requires ...
0
votes
1answer
67 views

Converting -48 VDC to +12 or +24 VDC 10 Amps or more

Good day, I would like the simplest way to reliably convert -48 VDC (Telcom DC Plant -42 through -56) to either +12 VDC or +24 VDC, the crux is I need at least 10 Amps. What I am trying to do is ...
0
votes
2answers
78 views

How to switch yard lights without ending up with a really long circuit

We're planning to install some area lights in the farm yard, and want to be able to turn them on from the house. This is simple enough with normal house switches, but I'm concerned that the overall ...
-1
votes
1answer
124 views

L.E.Ds bright enough for stage lighting?

Can anyone tell me what power level one would need for LEDs meant to light stages, or point me at how to figure that out from product descriptions? Edit for more info, I'm wanting to make wide throw ...
2
votes
3answers
313 views

Can I use ethernet instead of DMX for DIY led lighting?

I've read that while most pro-lighting is uses dmx, some intelligent lighting rigs use ethernet. I'm interested in building some MCU controlled L.E.D. footlights for my stage show, and currently know ...
0
votes
2answers
120 views

How do I remove the excess wires from this 2/3 way lighting switch?

I have two sets of lights in my bedroom. There are also two light switches. One double light switch is by one door, and turns both sets of lights on or off (one switch does one set, one does the other)...
1
vote
2answers
19k views

Best way to power Christmas lights without nearby outlet

I want to power Christmas lights (without a nearby power outlet) for at least 2 hours and was wondering how to go about it. The lights run on 120V AC and draw .34A per strip (about 40 watts) and I ...
0
votes
2answers
492 views

Smooth and no-flickering dimmable light source

My goal is to record a video with a varying intensity light source. No flickering at any frame rate (frame rate 30 60 120 240) while watching frame by frame, not human eye. Smooth dim level Any type ...
1
vote
0answers
100 views

Commercial 1.5m / 5' LED light fitting parallel LED arrangement

I am reviewing LED light fittings for an industrial premises refit. As with most of the experienced users on this site I like to understand what I'm purchasing and have opened up a sample fitting to ...