The lamp tag has no wiki summary.
34
votes
6answers
5k views
Does turning a lighbulb on and off repeatedly use more energy than just leaving it on for hours?
Let's say I have a 60W bulb in a lamp in my bedroom. If I kept the lamp on for 2 hours straight but the next day, I switched it on and off 10 times in intervals of 5 minutes. Which scenario would use ...
6
votes
2answers
209 views
Lighting metal halide lamp
I want to use some metal halide lamps (5-7*150W) to get some decent lighting in my room.
Unfortunately, inductors for these lamps have weight about 2kg each. I cannot accept 10kg of metal hanging ...
4
votes
3answers
439 views
What's the problem in designing a bright enough LED lamp?
So far the most powerful household LED lamp I've seen had consumption of 2.1 Watts and gave light equivalent to maybe 15-25 Watts incandescent lamp. That's maybe good for illuminating a Christmas ...
2
votes
1answer
120 views
How does a dual-wattage (automotive) bulb work?
I have a motorcycle headlamp bulb on my desk here. I notice the bulb has a rating of "60/55W" and has three connectors instead of the usual two.
Evidently these correspond to the high/low beam ...
1
vote
4answers
397 views
Calculating parallel resistance of a rated bulb
I have a bulb rated 110 V, 60 W and is in series with another bulb which is 110 V, 110 W. It's being powered with a 220 V source. Now, what would be the resistance of the resistor to be added in ...
1
vote
1answer
1k views
How could I replace the lamp on a regular projector for a LED lamp?
I have a 1080p projector and I want to change the regular 230w lamp for a LED lamp that uses less energy and lasts longer.
How complex would this be? LED projectors with these specs are ridicously ...
1
vote
1answer
1k views
Driving 12v Halogen lamps (Downlights)
12v Halogen lamps, do they need any special driving?
I have seen on some transformers that they output Half-wave rectification to the 12v halogen lamps. Is this how they should be driven or can ...
1
vote
1answer
210 views
Switch lamp with two serial switches
I have a lamp, with the usual built-in switch, which is powered via a wall-mounted socket. The socket is switched itself with a normal wall switch. So, both switches operate in series, the lamp lights ...
0
votes
2answers
132 views
How do I choose a lamp?
I've got a project I'm working on, which is essentially a set of MCU-controlled relays. I'd like to set up a test harness for the system, using something visual on the outputs. I was thinking some ...
0
votes
1answer
193 views
10-Bulb Edison Chandelier
I'd like to make this chandelier:
But before I embark on this quest I've few questions.
Cleverly titled "edison chandelier", this thing has 10 incandescent bulbs so energy consumption will be ...
0
votes
2answers
76 views
USB Lamp, controlled by linux driver
I want to build a simple USB lamp (maybe colored LED lamp) which will be controlled by PC. So, actually, i want to get practice in linux kernel modules development, but i need to get appropriate ...
