Electronics > Projects, Designs, and Technical Stuff

Halogen vs LED

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Hextejas:
If I did the google search correctly, it looks like there are a lot to try. The spec sheets are daunting.  :palm:

SiliconWizard:
But what's the application? Looks like a bulb for cars or something, but just tell us what it is used for.

mariush:
The halogen says 14v 35w ... in fact you can still buy the bulbs : https://www.eevblog.com/forum/projects/halogen-vs-led/

You can assume that's 14v AC and I guess it's supposed to be used with lamps or things that use a dumb 12v AC transformer inside to provide isolation from mains.

You could use LEDs but first you must convert the AC to DC using a diode (cheap but led would be off half the time, so you'd get flicker) or a bridge rectifier (for full wave rectification, less flicker)
Then you'd add a small capacitor to smooth the rectifier voltage and then you'd want to limit the current going through the led otherwise it would burn up.
Now you get a LED with a forward voltage less than your average DC input and you need to limit current going through it otherwise you'll damage it.  Either use a plain simple resistor or use a led driver


Zero999:
A capacitive dropper can be used before the rectifier to save burning off lots of power in a resistor.

Another option is to look for retrofit LED bulbs which can replace halogen bulb, with no extra components: the bridge rectifier and current limiting circuitry is built-in.

tooki:
Be sure to throughly clean that bulb with isopropyl before using it again; the skin oils deposited by handling with bare hands cause hotspots on the quartz envelope which will cause it to fail.

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