Author Topic: Halogen vs LED  (Read 1498 times)

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Offline HextejasTopic starter

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Halogen vs LED
« on: October 09, 2019, 05:58:46 pm »
Say, can i replace a halogen lamp bulb with an LED bulb ? I think not but thought I would ask
and here is a picture of the bulb and spec sheet.
« Last Edit: October 10, 2019, 01:23:01 am by Hextejas »
 

Offline schmitt trigger

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Re: Halogen vs LED
« Reply #1 on: October 09, 2019, 06:06:17 pm »
There are LED replacements for Halogen lamps offered from many vendors.

Although the power consumption will significantly decrease, the CRI will suffer.

Halogen lamps are the CRI champions.
 

Online Gyro

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Re: Halogen vs LED
« Reply #2 on: October 09, 2019, 06:10:36 pm »
Say, can i replace a halogen lamp bulb with an LED bulb ? I think not but thought I would ask

It's probably a good idea for you to take a step back before posting a question, and asking yourself what sort of background information and details you should provide, in order of people to stand a chance of being able to sensibly answer it.
Best Regards, Chris
 
The following users thanked this post: Someone, thm_w, nuclearcat, jhpadjustable, SiliconWizard

Offline Someone

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Re: Halogen vs LED
« Reply #3 on: October 09, 2019, 08:35:28 pm »
Say, can i replace a halogen lamp bulb with an LED bulb ?
Yes

I think not but thought I would ask
Why do you think not? I think yes.
 

Offline ejeffrey

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Re: Halogen vs LED
« Reply #4 on: October 09, 2019, 09:02:13 pm »
What type of lamp?
 

Offline HextejasTopic starter

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Re: Halogen vs LED
« Reply #5 on: October 10, 2019, 01:49:27 am »
If I did the google search correctly, it looks like there are a lot to try. The spec sheets are daunting.  :palm:
 

Offline SiliconWizard

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Re: Halogen vs LED
« Reply #6 on: October 10, 2019, 12:56:17 pm »
But what's the application? Looks like a bulb for cars or something, but just tell us what it is used for.
 

Offline mariush

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Re: Halogen vs LED
« Reply #7 on: October 10, 2019, 03:14:28 pm »
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


 

Online Zero999

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Re: Halogen vs LED
« Reply #8 on: October 11, 2019, 09:30:13 am »
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.
 

Offline tooki

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Re: Halogen vs LED
« Reply #9 on: October 11, 2019, 10:09:51 pm »
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.
« Last Edit: October 11, 2019, 10:13:56 pm by tooki »
 


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