http://www.lamptech.co.uk/Spec Sheets/TH RM Q150MR16-21 EJM GE.htm
`
`11/16/2016 10:04 PM
`
`In 1965 the MR16 lamp design made its first
`appearance, in the form of this EJM Projector source
`invented by Emmet Wiley of General Electric USA. It
`was GE's halogen answer to the earlier Tru-Beam
`format of incandescent projector lamps, launched a few
`years earlier by Sylvania.
`
`The Sylvania lamp had one principal weakness, in that
`it was not a pre-focussed lamp. Owing to the variation
`in the shape of the vacuum-formed reflector and the
`further variation introduced when fusing the front lens
`to the mirror, the reflector rim could no longer be used
`as a datum from which to measure the distance to the
`optical focus point. The only remaining reference was
`its flat base, but there existed quite some variation in
`the distance from this to the focus point.
`
`GE overcame this limitation by first forming a high
`precision pressed glass reflector, and cementing a
`single ended halogen capsule into it. The capsule could
`be focussed to a high degree of accuracy in the mirror,
`and the reflector rim used as the reference plane. For
`the first time this separated the electrical and
`mechanical connections to the lamp - formerly both had
`been effected via the same base. Now it was possible to
`mechanically locate the lamp in the projector by the
`reflector rim, and make the electrical connection via
`flexible cables. Consequently the location of the optical
`focus point was precisely fixed from lamp to lamp.
`
`The first MR16 lamp was this EJM, employing a
`specular dichroic mirror. It was soon joined by EJN,
`differing only in its focal point. Later the EJS followed,
`featuring higher output with shorter life. The next
`major development in MR16 lamps did not come until
`1971, with the invention of the facetted reflector to
`attain better beam homogeneity.
`
`Manufacturer:
`Lamp Power:
`Lamp Voltage:
`Lamp Current:
`Cap Type:
`Bulb Type:
`Bulb Finish:
`Filament Type:
`Atmosphere:
`Luminous Flux:
`Luminous Efficacy:
`Peak Intensity:
`Beam Distribution:
`Colour Temperature & CRI:
`Chromaticity Co-ordinates:
`Rated Lifetime:
`Burning Position:
`Max. Overall Length:
`Working Distance:
`Factory:
`Date of Manufacture:
`Original / Present Value:
`
`Nickel Pins
`MR-16 in eighths/inch
`Quartz capsule
`
`General Electric Co. U.S.A.
`150 Watts
`21 Volts
`7.14 Amperes
`GX5.3
`MR-51
`Dichroic Mirror
`CC-6
`Bromine-Argon
`N/A
`N/A
`1200 candelas
`44 mm focal dist.
`CCT: 3350K
`CCx: 0.406
`40 hours
`Universal
`44 mm
`38 mm
`Bellevue, OH
`1967
`
`CRI: Ra 99
`CCy: 0.394
`to 50% survival
`
`1 3/4"
`1 1/2"
`U.S.A.
`
`References:1) GE Photographic Lamp & Equipment Guide 1967 P7-6P
`
`
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`PHILIPS EXHIBIT 2003
`WAC v. PHILIPS
`IPR2016-01455