Halogen vs LED - Page 1
Forum section: electronics / projects

author: Hextejas
author_rank: Frequent Contributor
timestamp: October 09, 2019, 05:58:46 pm
content: Say, can i replace a halogen lamp bulb with an LED bulb ? I think not but thought I would askand here is a picture of the bulb and spec sheet.

author: schmitt trigger
author_rank: Super Contributor
timestamp: October 09, 2019, 06:06:17 pm
content: 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.

author: Gyro
author_rank: Super Contributor
timestamp: October 09, 2019, 06:10:36 pm
content: Quote from: Hextejas on October 09, 2019, 05:58:46 pmIt'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.

author: Someone
author_rank: Super Contributor
timestamp: October 09, 2019, 08:35:28 pm
content: Quote from: Hextejas on October 09, 2019, 05:58:46 pmYesQuote from: Hextejas on October 09, 2019, 05:58:46 pmWhy do you think not? I think yes.

author: ejeffrey
author_rank: Super Contributor
timestamp: October 09, 2019, 09:02:13 pm
content: What type of lamp?

author: Hextejas
author_rank: Frequent Contributor
timestamp: October 10, 2019, 01:49:27 am
content: If I did the google search correctly, it looks like there are a lot to try. The spec sheets are daunting.

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 10, 2019, 12:56:17 pm
content: But what's the application? Looks like a bulb for cars or something, but just tell us what it is used for.

author: mariush
author_rank: Super Contributor
timestamp: October 10, 2019, 03:14:28 pm
content: 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

author: Zero999
author_rank: Super Contributor
timestamp: October 11, 2019, 09:30:13 am
content: 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.

author: tooki
author_rank: Super Contributor
timestamp: October 11, 2019, 10:09:51 pm
content: 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.