http://www.imigyled.com/

http://www.imigyled.com/

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This is'a difficult question to answer as any generalisation may mislead.Just because halogen lamps come in established power doses doen't mean that the corresponding light levels of these lamps are appropriate for the situation in which they are used.

Well according to me as an LED an operate at max 12V DC, so its out of question that an LED can match the power output of Halogen Lamps....

Posted By Chloe Taylor on 16 May 2011 07:33 PM
Well according to me as an LED an operate at max 12V DC, so its out of question that an LED can match the power output of Halogen Lamps....

LEDs are used for street lights and can far exceed the output of halogen


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Posted By Chloe Taylor on 16 May 2011 07:33 PM
Well according to me as an LED an operate at max 12V DC, so its out of question that an LED can match the power output of Halogen Lamps....

The LEDs themselves operate at much lower forward drops than 12V DC (the blue LED that are used in all white-light LEDs operate about 3.75-4V) and those forward drops are variable with both temperature and current.  The internal power supplies in LED assemblies regulate the current to the LED to compensate for the variance with temp.  Those power supplies can be designed to run with any number of AC or DC input voltage, over a wide range of input power.

The total power dissipated is voltage x current.  Individual LEDs in the assembly are typically limited to well under 10 Watts, but there is no inherent limit to the number of LEDs or the amount of power that can be designed into an assembly.  (I've designed infra-red illlumination systems that had as many as 192 individual LED, that ran a few 10s of watts.)

The luminous efficiency of blue/white LEDs is also between 2-8x (depending on the LEDs & phosphors use) that of halogens too.  Total light output isn't a problem with LEDS, glare is, as well as the highly directional inherent to LEDs.  It's easy make decent PAR-bulb type photometrics using LEDs, but more difficult to simulate istotropic A-bulb characterisics with small numbers of LED.

Posted By siddle on 17 Apr 2011 01:05 PM
A quick question. Heard that many of these LED bulbs do have the same on-axis intensity as a halogen? Is it true? Please clarify.
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well i sont think so, who told you all this in the first place.... you are mixing halagon bulbs with LEDS....

Most come with optometric specifications- you can compare if you like.

Many of the 8+ watt LED downlights wil have 40-degree PAR halogen type optometrics, but not the overall luminosity. Some of the lower power MR16s are a pretty good good approximation of low-power halogens though.

Posted By Dana1 on 14 Jun 2011 10:00 AM
Most come with optometric specifications- you can compare if you like.

Many of the 8+ watt LED downlights wil have 40-degree PAR halogen type optometrics, but not the overall luminosity. Some of the lower power MR16s are a pretty good good approximation of low-power halogens though.

Thanks a lot for sharing the information as to which type of LED use halogrens in their downlight......