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C.I.B.S. 90th Anniversary Lamp

C.I.B.S. 90th Anniversary Lamp

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Here is another unusual mushroom lamp made by Thorn Lighting. This was made as a commemorative gift for members of the Chartered Institute of Building Services Engineers, which was formed in 1976 when the Illuminating Engineering Society merged with the Institution of Heating and Ventilation Engineers.

Rather unusually the lamp is rated 90 Watts. It was developed by Thorn as an energy-saving version of its normal mushroom-shape Netabulb lamps. Actually the energy saving 'technology' is not very impressive, it is not even Krypton-filled like its European counterparts. They simply changed the normal white-coated mushroom bulbs for a Pearl mushroom envelope, which has a higher light transmission and enabled 10% energy saving with about 5% drop in light output vs mushroom lamps (but of course about 10% drop vs ordinary pearl lamps).

IN R GE 120-100A21SB-E26.jpg IN R GE 125-200PS30WB-E26.jpg 1C9CBF3E-2CF4-4E54-8323-0A9E0AFE7A59.jpeg AA8E1D6C-9C42-487B-8F57-ECB7029AC11C.jpeg

Light Information

Light Information

Manufacturer:Thorn Lighting
Lamp
Lamp Type:Incandescent
Filament/Radiator Type:CC-9/2s
Base:B22d/25x26 aluminium
Shape/Finish:K60 Pearl
Service Life:1000 hours
Electrical
Wattage:90W
Voltage:240V
Optical
Lumen Output:1175lm Initial
Lumen Efficacy:13.0lm/W Initial
Color Temperature:2700K
Color Rendering Index:100
Physical/Production
Factory Location:Preston Fylde Road http://www.lamptech.co.uk/Documents/Factory%20-%20UK%20-%20Preston%20Fylde.htm
Application/Use:Home lighting

File information

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migette1
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Peter


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Oct 07, 2018 at 03:52 AM Author: migette1
Hi more history on these mushrooms thanks James

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

Keiron
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Oct 12, 2018 at 06:08 PM Author: Keiron
Nice lamp, I just picked up a pearl mushroom lamp, sadly no packaging & etch is worn.

Mazda lamps stay brighter longer :-)

migette1
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Oct 13, 2018 at 05:21 AM Author: migette1
Keiron put it up someone may know maker or have a good guess

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

Keiron
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Oct 13, 2018 at 08:17 AM Author: Keiron
I will, I've got quiet a few things to post when I get round to it.

Mazda lamps stay brighter longer :-)

sox35
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Oct 13, 2018 at 12:38 PM Author: sox35
I confess I was never a great fan of the mushroom shape, perhaps because I don't like 'real' mushrooms

This is certainly an interesting one though, mainly due to the choice of 90W for the wattage. I've always wondered how and why wattage ratings for different types of lamp were chosen; 15/25/40/60/75/100W for low wattage incandescents, for example. And 50/80/125W for MV lamps, 35/70W for HPS etc. Anyone got any ideas..?

Ria in Aberdeen
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James
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Oct 13, 2018 at 01:02 PM Author: James
The original GLS lamp ratings were set broadly according to ISO standard numbers in terms of their light output. The ISO intervals are convenient steps for rating many different things, perhaps they were most widely used for old mechanical camera shutter durations. Things drifted slightly when the marketing people introduced problems a century ago and started rating lamps by power consumption instead of light output.

For discharge lamps it was similar. Eg the first 400W mercury lamp was developed to match the 16000lm output of 1000W GLS, 250W to replace 500W GLS etc. The 125W and 80W were derived from their original outputs of 5000lm and 3000lm respectively. I think 1000W was launched because it was a convenient round number, and 700W was halfway between 400 and 1000W.

Low pressure sodium lamps were launched with lumen values to realign with the ISO number intervals. High pressure sodium wattages were approximately set to match the lumen values of the mercury range with a particular energy saving.
sox35
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Oct 13, 2018 at 01:09 PM Author: sox35
Thanks James, I guessed you'd have the answer, as always

I notice that lamps are starting to be sold by lumen output rather than wattage now, as well.

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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