Talk:Multifaceted reflector

Why the facets?

This article doesn't mention at all why the reflectors are faceted instead of a smooth parabolic reflector. Is it possible for someone to describe the advantages of this arrangement? FletcherD (talk) 08:27, 2 November 2022 (UTC)[reply]

MR11 basing

The article currently says:

MR11 and MR8 lamps have pins placed more closely together, preventing them from accidentially being interchanged with MR16 lamps.

Brianpirie, are you sure about that? I'm almost certain I've operated MR11 lamps in a socket that was intended for MR16 lamps.

Atlant 13:42, 9 January 2007 (UTC)[reply]

MR11 and MR8 lamps typically have a G4 base with a 4mm pin spread while MR16 lamps have a GX5.3 with a 5.33mm spread between the two round pins. You could possibly force one into a socket made for another.

Today, MR16 lamps come in a very wide variety of bases including E26, Gx5.3, GU5.3,G8, GU10, GY7.9 and I am sure others. Manufacturers are constantly adapting lamps to new bases and introducing new ones. I would be uncomfortable claiming that certain lamp shapes only come with certain bases, there are just too many out there to make that kind of statement.

Wikipedia has a section on lightbulb sockets and specifically bi-pin connectors. Perhaps this should be included in the article^[1]

Tsadowski (talk) 07:45, 23 February 2014 (UTC)[reply]

References

^ https://en.wikipedia.org/wiki/Bi-pin_connector

Filament temp

"The combination of the halogen light source and dichroic coating also means that these lamps provide a high color rendering index and a higher color temperature than standard incandescent bulbs."

higher CCT is due to the higher filament temp of halogen lamps. Halogens don't have higher CRI than non-halo filaments, both are apx 100. The dichroic coating doesnt have much effect on either, though if any effect, it can reduce CRI just a little. Tabby (talk) 01:52, 15 February 2008 (UTC)[reply]

Dichroic reflectors

The statement about never using dichroic lamps in recessed lighting appears to be an over-generalization:

"Dichroic lamps, however must never be used in recessed lighting as they are a common ignition source for building fires."

Virtually all recessed fixtures sold in the U.S. have thermal protection (per the Underwriters Laboratories voluntary standards), and manufacturers have not restricted their MR16 recessed fixtures to non-dichroic lamps (e.g., Philips/Lightolier and Cooper Lighting/Halo). Additionally, the IEC 60598 labeling on MR16 packaging does not appear to be used in the U.S. Apparently that designation is for products sold elsewhere, such as Australia and EU countries. Caseyjonz (talk) —Preceding undated comment added 04:44, 1 March 2010 (UTC).[reply]

Time passes

Is this to-day or yesterday?

The most efficient of these lamps available today produce about 70 lm/W, which exceeds the efficiency of compact fluorescent lamps.

Bad smells

This seems rather unencyclopaedic

the smell can be as pleasant as toast or as bad as having a nearby oil refinery — Preceding unsigned comment added by 86.23.47.157 (talk) 10:38, 27 December 2011 (UTC)[reply]

Is "Multifaceted Reflector" a backronym?

The article says that the MR16 was first sold in 1965, but that those lamps weren't faceted. That implies that, if they were called "MR16" at the time that the "M" didn't mean "multifaceted", and that "MR" is a backronym. Or, that they were called something besides MR16s, and we should say what that was. Any idea which would be true? -- Dan Griscom (talk) 11:41, 29 June 2013 (UTC)[reply]

Actually the original patent US patent #4021659 by Emmett Wiley Filed October 30, 1975, is based on the principle of the reflector being multifaceted. The lamp was not called an MR16 in the patent but it is obvious by the patent drawings that this was destine to become what is known as the MR16. The patent was filed in 1975 and the article states that MR-16 were sold first in 1965. The error in the article must be that whatever lamps were sold in 1965 were not called MR16s. MR is not a "Backronym" it's just that whatever lamps were sold prior to the introduction of MR16's were not MR16s. patent reference: ^[1] Tsadowski (talk) 17:13, 21 February 2014 (UTC)[reply]

References

^ http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2&f=G&l=50&co1=AND&d=PTXT&s1=%22Emmett+Wiley%22&OS=%22Emmett+Wiley%22&RS=%22Emmett+Wiley%22

Reflector sizes vs. pin configurations

From Design and construction:

"Halogen MR16 lamps consist of a halogen capsule (bulb) integrated with a pressed glass reflector. The reflector of an MR16 lamp is 2 inches (51 mm) in diameter. The base conforms to bi-pin GU5.3 standard."

This last part is incorrect, or at least, incomplete. Low-voltage (12 V) MR16 lamp bases have the GU5.3 bi-pin configuration, but mains-voltage MR16s have the GU10 twist-lock bi-pin configuration.

RedGreenInBlue (talk) 10:52, 29 October 2013 (UTC)[reply]

Base type is independent of voltage. 120 volt MR16 are available in both GU5.3 bi-pin and GU10 bases. Low voltage MR16's are also available in either base. A quick look at lighting catalogs on the web will confirm this. MR16 lamps are available in (at least) 5 different bases^[1] Tsadowski (talk) 17:58, 21 February 2014 (UTC)[reply]

References

^ http://www.lrc.rpi.edu/nlpip/lightinganswers/mr16/whatAreMR16.asp

Operation

Under "operation" the article states: "MR16 lamps are available in 10–50 W power ratings (150–800 lumens)." Actually MR16 lamps are available to at least 300 watts as an ELH MR16 (rated at 300 watts at 120 volts), which has applications in stage and studio. The lamps were originally developed as projector lamps which had to have a high light output and consequently high wattage. See US patent #4021659.Tsadowski (talk) 16:58, 21 February 2014 (UTC)[reply]

ANSI designations

I suggest citing the Lighting Research Center ^[1] to support the Beam Angle Nomenclature. Tsadowski (talk) 18:09, 21 February 2014 (UTC)[reply]

References

^ http://www.lrc.rpi.edu/programs/nlpip/lightingAnswers/mr16/needToKnow01.asp

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Nonsense or real MR in 1965

The MR16 lamp was first sold in 1965.

... Note that this lamp was not "multifaceted"; faceted reflectors were introduced in 1971.

So WTF? --2003:F2:8701:E641:1841:BEE9:C60D:1F5B (talk) 21:56, 10 August 2021 (UTC)[reply]

[1] ttps://en.wikipedia.org/wiki/Bi-pin_connector

[2] ttp://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2&f=G&l=50&co1=AND&d=PTXT&s1=%22Emmett+Wiley%22&OS=%22Emmett+Wiley%22&RS=%22Emmett+Wiley%22

[3] ttp://www.lrc.rpi.edu/nlpip/lightinganswers/mr16/whatAreMR16.asp

[4] ttp://www.lrc.rpi.edu/programs/nlpip/lightingAnswers/mr16/needToKnow01.asp

[1]

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