Re: New GE Incandescent Lamp Technology
- From: "James D. Hooker" <jdh@xxxxxxxxxxxxxx>
- Date: Fri, 15 Jun 2007 19:03:52 GMT
The CDM Elite is indeed a most impressive lamp. I tried out a few samples
back in May 2005 when they were first launched in Europe and what's
especially impressive is how they slowed the rate of lumen depreciation.
Ceramic MH normally suffers a very rapid lumen drop, but even at end of
life, the Elite lamps are said to deliver higher luminous flux than brand
new lamps of the standard design.
The way they seem to have boosted the efficacy and CRI was simply to
increase the wall loading. The 70W samples had PCA burners roughly the same
dimensions as standard 35W types. Interestingly the outer jackets were
gas-filled instead of the usual vacuum - presumably to solve issues of
thermal stress in the PCA.
Other lamps on the market can reproduce the CRI and efficacy of Elite, many
of the Japanese firms already achieve this with formed body PCA like the
Powerball. But I still think the real smart thing with Elite is being able
to do this while also improving lumen maintenance.
Unfortunately the Elite of 2 years ago was only on sale for a few months.
The one thing that did suffer was lamp life - which was presumably OK in the
laboratory test racks, but turned out to be only 2000 hours or so when used
in real fixtures, where the lamps burn hotter. Clearly also using a
gas-filled outer jacket means that the arc tube temperature is much more
under the influence of the individual fixture design. Probably performance
was much worse in some fixtures than others, preventing the lamp from being
sold as a true retrofit. After 2 years back in the labs, hopefully it will
do better this time around!
The Halogená® Energy Advantage also seems like a simple but smart idea. It
looks like they just took the burners from their IRC-PAR lamps and mounted
it in a regular T60 bulb. But the efficacy seems remarkably high. The
50W/120V lamp is achieving 22lm/W in a white-coated bulb, so the burner
itself will be putting out about 5% more light and must be around 23lm/W.
This compares extremely favourably with the 24lm/W of the 50W 12-volt IRC
capsules, which is surprising because the 12V lamps are generally much more
efficient than 120V.
James
"Paul M. Eldridge" <paul.eldridge@xxxxxxxxxxxxxxx> wrote in message
news:bg4373586ulf1s0cq3j1drruch35t1ivak@xxxxxxxxxx
Just as an update to our previous conversation, Philips will be
introducing their Halogená® Energy Advantage lamps in Q3. These lamps
produce roughly 1.5 more light, per watt, than a standard Halogená.
The 70-watt version is rated at 1,600 lumens, or just a hair under 23
lumens per watt; not too shabby, IMO.
For more information, see page 27 of their new products guide:
http://www.nam.lighting.philips.com/can/ecatalog/catalogs/p-5635.pdf?PHPSESSID=7d975baf52845708c9da224191dd8edd
The new MasterColour Elite line of ceramic metal halide lamps is
pretty darn impressive as well. Their 70-watt T4 offers significantly
higher lumen output (7,300 lumens versus 6,400 for their standard
offering), longer service life (12,000 hours versus 9,000), a CRI of
90+ (versus 83) and better than 80 per cent lumen maintenance at end
of life (versus 60 to 70 per cent). Correct me if I'm wrong, but I
don't think there's anything else out there that approaches this level
of performance.
Cheers,
Paul
.
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