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70w Sylvania Metal Halid with internal ignitor.

70w Sylvania Metal Halid with internal ignitor.

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70w Sylvania Metal Halid with internal ignitor.

osram 70w.jpg MH I.jpg philips china.jpg Image047~0.jpg

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Filename:MH I.jpg
Album name:Liam / HPS MH & MV
Keywords:Lamps
File Size:68 KB
Date added:Aug 25, 2018
Dimensions:960 x 1280 pixels
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Make:Nokia
Model:6300
Software:V 05.50
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Alex
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Mit dem Osten Siegen!


Alex_lightning jurgenneandertal
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Aug 25, 2018 at 11:06 AM Author: Alex
Never seen something like that made by Sylvania

Lamp and Valve collector

sox35
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Mainly the electrical side of things


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Aug 25, 2018 at 11:10 AM Author: sox35
They're around, although personally I prefer lamps without internal ignitors. Most fittings intended for HPS/MH here have ignitors fitted anyway, so no need for lamps like this.

Ria in Aberdeen
It'll be all right in the end, and if it isn't all right, it isn't the end  Smiley

Liam
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Aug 25, 2018 at 05:35 PM Author: Liam
This lamp is an engineering sample probably the only one of its kind in the world.

My gallery http://www.lighting-gallery.net/gallery/index.php?cat=11495

sox35
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Mainly the electrical side of things


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Aug 25, 2018 at 05:36 PM Author: sox35

This lamp is an engineering sample probably the only one of its kind in the world.

The best sort of lamp to have

Ria in Aberdeen
It'll be all right in the end, and if it isn't all right, it isn't the end  Smiley

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Aug 26, 2018 at 11:41 AM Author: Max

This lamp is an engineering sample probably the only one of its kind in the world.

Philips made a nearly identical lamp, the CDO/H 110W, which was meant to retrofit 125 W mercury lamps in their sockets. This lamp was sold for a few years only in the early 2010s and was delisted because of issues related to ballast overheating and HV insulation. I have one in clear version and except for the burner shape, it looks exactly the same. It would be interesting to hear this lamp's background story from James though.
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Aug 26, 2018 at 03:30 PM Author: James
This lamp is indeed also a mercury retrofit, of similar concept to Philips CDO-H and it was not launched for the same reasons that Max details above.

When it was announced that both mercury lamps as well as HPS retrofits for mercury would be banned, I suppose several manufacturers started work on a new replacement lamp. But this is not so easy.

To make a new HID lamp that could replace mercury while also meeting the ErP regulations which phased out the latter, quite high efficacy is needed. This calls for expensive lamp designs. To recover the higher cost of those lamps there should be some energysaving during life, i.e. reduced wattage. The traditional way to reduce power without having to change the ballast is to reduce the arc voltage. However given the shape of the ballast curve, this tends to cause an increase in the lamp and ballast current. In the case of HPS lamps retrofitting mercury this is not such a problem, because HPS lamps have a very different power factor than mercury and metal halide lamps, and this enables quite significant voltage reductions (and hence power reduction) with only minimal increase in lamp current.

However since the power factor of metal halide arcs is similar to mercury arcs, this feature is not present. It was found that even quite small power reductions lead to current increases that can case the burn-out of some older types of mercury ballasts.

The Ceramerc lamp in the picture was a prototype of approx. 70W to replace 80W mercury. It has a neon-filled arc tube for easier ignition, plus a glowbottle starter. Even for this small 10W power saving, it was found to damage some mercury ballasts in the field. It was therefore never launched by Sylvania. Philips did however launch its 70W and 110W CDO-HP lamps, but as Max states they were quickly withdrawn after the field problems were discovered (although some wholesalers online still seem to have stocks for sale!).

Sylvania changed its approach to solve this problem, which led to the development of the "Relumina" lamps. These solved the current increase problem by including a secondary small ballast inside the lamp base, which works in series with the normal mercury ballast to reduce lamp power. The principle was a direct development of the SHX-S lamps that had been sold by Sylvania in the 1980s based on a similar design around HPS lamps - to replace 125W mercury with 85W sodium and achieve a much bigger energy saving than the normal 110W sodium retrofits. Despite the excellent performance the SHX-S was not very successful because the additional ballast in the large lamp base made it quite expensive - however we decided that since the mercury lamps were being banned completely, many consumers would be willing to pay the high price for a metal halide version because it would be cheaper than changing the whole luminaire. So the Relumina was launched in 55W and 85W versions to replace 80W and 125W mercury. The large energy saving made them quite attractive and in some countries they quickly became a success. Later the power was reduced to 50W and 80W and a larger 150W lamp was added to replace 250W mercury.

So the lamp in this photo is indeed very rare, only a few thousand were made for testing and field trials (and normally in coated bulbs, similar to mercury).

Incidentally, Iwasaki was the only other manufacturer to launch a technically successful retrofit for 80W and 125W mercury. However they did not use the inductive ballast inside the lamp, and to avoid the ballast overheating problem their mercury retrofits were rated 80W and 120W. So they did not really deliver any notable energy saving, and being quite expensive lamps they were also not popular and seem to have been withdrawn except in Australia.
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Aug 26, 2018 at 04:06 PM Author: Max
Thanks James. As usual, this is a very interesting read.
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