Originally Posted by
seeker333
So, you're saying a 35usd p7 flashlight is brighter than 2x20w halogens, because you say so ?
I'm simply trying to make an informed decision. Don't need some anonymous internet poster spewing bullets of half-truths to render a non-answer to a simple question.
Now that's getting personal. You may ignore my post, or this thread if want to.
Originally Posted by
seeker333
A mr16 is in fact much brighter than the same (20w) rated mr11. You would know this to be true in a second if you had ever actually compared them. This is the main reason why DIYers use mr16. MR11s aren't as bright, they're hard to find, and significantly more expensive.
Lumens, no. Lux, yes. The bulbs are the same. The larger reflector of a mr16 is better at capturing the light and focusing it then a mr11, hence higher lux. A mr11 has more leakage of light then a mr16.
Originally Posted by
seeker333
Either leds have taken huge leaps in the last year, or you have some crummy mr lights.
LEDS have taken huge leaps in the last 2 years.
Originally Posted by
seeker333
I've used the website below occasionally for ideas, and have based decisions and comments on the data presented there. It may be inaccurate. If you have better information, please share it.
http://nordicgroup.us/s78/
http://nordicgroup.us/s78/wattslumens.html
PS - I'm not trying to debate anyone, just want to cut thru the BS and get at the facts.
That site is outdated and the information is inaccurate. First, According to their own
source, halogens emit 18-22 lumens per watt. Which is very different from the numbers they list. Second, even a wiki search shows it to be otherwise.
Luminous Efficacy. Also check a physics textbook and they show different numbers. Third, according to the
lighting research center,
Lumen output:
Most lamp manufacturers do not publish lumen output ratings for MR16 lamps or other reflectorized lamps in their catalogs. Instead, they publish beam angle and CBCP, which provide more accurate information about the performance characteristics of the lamp. NLPIP tested several 50-watt MR16 samples of the same type (EXN) to determine their lumen output, which ranged between 560 lumens to 710 lumens, and averaged 625 lumens.
Now that's for a 50W halogen, imagine what 20W halogen would be rated at (averaged 250 lumens).
For accurate information check this
site. It contains a wealth of information on lights including leds, halogen, incans, h.i.d., etc.