Search found 76 matches

by James
Mon Jul 18, 2016 7:36 am
Forum: Lamps
Topic: Thorn Gold Tubes - Phosphor
Replies: 1
Views: 1545

Re: Thorn Gold Tubes - Phosphor

Not the phosphor, but on top of the phosphor was a coating of yellow cadmium (and red for the red tubes). It is poisonous by ingestion or breathing in the dust. You would have to consume rather a lot though!
by James
Sun Jan 17, 2016 11:51 am
Forum: Lamps
Topic: The New Super Effecient Incandescent?
Replies: 3
Views: 1996

Re: The New Super Effecient Incandescent?

LED is indeed now up to 50% efficacy, and fluorescent well above 30%. The journalists hyping up this latest development haven't a clue what they are talking about!
by James
Fri Jun 12, 2015 6:26 pm
Forum: Control Gear
Topic: 100/125 w gear
Replies: 8
Views: 2689

Re: 100/125 w gear

The original British 8' tube was the 125W rating, and it was designed for use on an ordinary 125W high pressure mercury ballast with series capacitor, and of course a starter-switch. The series capacitor gave this circuit a leading power factor and provided a convenient method to easily strike this ...
by James
Tue Mar 10, 2015 9:47 pm
Forum: Lamps
Topic: Double ended MR16 capsules?
Replies: 3
Views: 1198

Re: Double ended MR16 capsules?

This was used for the first Halogen-IRC MR16 lamps made by GE, Toshiba and Philips. It is much easier to accurately position the filament at the centre of a double-ended ellipsoidal capsule than the usual single-ended capsules. Since the performance of Halogen-IRC lamps is depending more than anythi...
by James
Fri Mar 06, 2015 11:31 pm
Forum: Control Gear
Topic: Magnetic ballast manufactures
Replies: 4
Views: 1712

Re: Magnetic ballast manufactures

MST in Poland took over the Philips ballast production (brilliant name, Magnetic Systems Technology) and is still in business. See http://www.mstechnology.pl
by James
Fri Mar 06, 2015 11:28 pm
Forum: Control Gear
Topic: 10w sox 60hz ballast
Replies: 3
Views: 1611

Re: 10w sox 60hz ballast

If you do it will overheat the ballast but only slightly. Incidentally last weekend I was visiting one another lamp collector colleagues in California who developed these American lights around GEC and Thorn's 10W SOX 30yrs ago and we discussed this very same topic! It was a custom made ballast that...
by James
Mon Feb 09, 2015 9:51 pm
Forum: Lamps
Topic: High voltage GLS lamps?
Replies: 7
Views: 1789

Re: High voltage GLS lamps?

Tom is right, typically they would use 5x 130V GLS in series, or 10x 65V. Other voltage GLS were also made for different configurations and were popular until not long ago. Even when I worked at GE Leicester in the late 1990s, 65V and 85V Omega Pluslife lamps were still in regular production there. ...
by James
Sat Jan 31, 2015 11:14 pm
Forum: Lamps
Topic: LED filament lamps?
Replies: 3
Views: 1138

Re: LED filament lamps?

The first one I know of was developed by Ushio of Japan, around 2008. See http://techon.nikkeibp.co.jp/english/NEWS_EN/20090106/163635/
by James
Sun Nov 30, 2014 8:10 pm
Forum: Street Lighting
Topic: I nearly crashed the car....
Replies: 6
Views: 1385

Re: I nearly crashed the car....

I'm not sure the polycarbonate bowl of an MA lantern would survive the more concentrated heat and photon flux of a SON for very long!
by James
Sat Nov 15, 2014 7:24 pm
Forum: Street Lighting
Topic: Well i may aswell give it a go... My Email to Urbis
Replies: 19
Views: 3896

Re: Well i may aswell give it a go... My Email to Urbis

I am not so sure Kev. Certainly the short term reliability (premature failures) is getting better but the life is not being extended so much. Typically it is about double that of SON. Also we see that the lifetime claims are starting to become more realistic i.e. lower. This is leading to new develo...
by James
Fri Nov 14, 2014 8:05 pm
Forum: Street Lighting
Topic: Well i may aswell give it a go... My Email to Urbis
Replies: 19
Views: 3896

Re: Well i may aswell give it a go... My Email to Urbis

I have to be honest that when done properly, LED streetlighting can deliver outstanding results. I have just come back from two weeks working around China and that country has been so swift to adopt LED that aside from a few Induction installations, this was the only form of streetlighting that I sa...
by James
Fri Nov 14, 2014 7:58 pm
Forum: Street Lighting
Topic: Red banding on SOX
Replies: 6
Views: 1540

Re: Red banding on SOX

One of the main reasons for this is poor uniformity of temperature along the length of the lamp. In part, this has to do with the quality of the IR coating on the outer bulb, but also the position of the electrodes and the dimensions of the U-bend. If temperature is too low at one part of the lamp, ...
by James
Fri Oct 03, 2014 8:33 pm
Forum: Lamps
Topic: Are Mercury Lamps Still Legal?
Replies: 8
Views: 1758

Re: Are Mercury Lamps Still Legal?

Interesting point slyspark, I had never considered running an MBF lamp on electronic gear. Maybe though, a Chinese magnetic ballast would still be more reliable in the long term, there is not so much that can go wrong with a simple choke! The phase-out date for MBF in Europe is 13th April 2015. SON ...
by James
Mon Aug 04, 2014 4:36 pm
Forum: Street Lighting
Topic: CRT, (as in Carbon Reduction Technology LTD)??
Replies: 8
Views: 1816

Re: CRT, (as in Carbon Reduction Technology LTD)??

There are not enough specifications given to enable its real performance to be assessed, unfortunately this is quite common to many of the new LED lamp/luminaire companies. But I am not impressed based on the quality of their materials online. I always laugh when the first thing they say about their...
by James
Fri Apr 25, 2014 6:40 pm
Forum: Lamps
Topic: Lamp temps?
Replies: 10
Views: 1999

Re: Lamp temps?

The actual bulb wall temperature depends on many things. Perhaps the three most important though are the atmosphere within the outer bulb, the dimensions, and the arc tube radiated spectrum Mercury lamps run hot because the outer bulbs are filled with nitrogen so as to prevent the arc tube wall from...
by James
Thu Apr 24, 2014 9:10 pm
Forum: Lamps
Topic: Bright Light Lamps?
Replies: 8
Views: 1668

Re: Bright Light Lamps?

I have a suspicion that Bright Light may just be a brand name and not the actual manufacturer. As far as I know, there were only three small fluorescent lampmakers in Britain. These were Endura-Viking lamps of Shipley, Lymelight of Newcastle-under-Lyme, and Longlamps of Finsbury Park and Reading. I ...
by James
Wed Jan 15, 2014 8:59 pm
Forum: Lamps
Topic: X-Files moment with 500 watt MBTF????
Replies: 13
Views: 2675

Re: X-Files moment with 500 watt MBTF????

Was it made by any chance in the mid to late 1980s? Around that time Philips had a problem with its mercury blended lamps which was identified when Thorn stopped making its own, and considered sourcing them from Philips until it was found that they suffered the defect you describe. In that case the ...
by James
Fri Dec 20, 2013 9:36 pm
Forum: Lamps
Topic: Class 1 LED Products?
Replies: 1
Views: 777

Re: Class 1 LED Products?

This is the result of the IEC 62471 standard "Photobiological Safety of Light Sources" being taken up as a requirement for CE marking. If certain products fall into risk group 1 or 2 for retinal burn hazard they need to carry this warning. For general lighting lamps you should not see this...
by James
Mon Dec 09, 2013 11:12 pm
Forum: Lamps
Topic: LED efficiencies????
Replies: 8
Views: 2060

Re: LED efficiencies????

Best I know of in a commercially available retrofit lamp, delivering 800 lumens of warm white light with high CRI and in true omnidirectional fashion just like GLS, is 110 lm/W efficacy. This includes the driver losses. Without the driver the efficacy of the LEDs themselves is a little over 130 lm/W...
by James
Thu Sep 26, 2013 9:41 pm
Forum: Lamps
Topic: Decent Rough Service Lamps
Replies: 7
Views: 1965

Re: Decent Rough Service Lamps

The best and one of the few genuine RS lamps still available are made by Dr. Fischer in France, who supply to many of the main brands. Avoid at all costs the companies who are sourcing elsewhere in Eastern EU or China because you are absolutely right, these lamps are not real RS types and only have ...
by James
Sat Sep 21, 2013 9:08 pm
Forum: Luminaires
Topic: Purple Glass Bowls On Coughtrie Bulkheads?
Replies: 6
Views: 3816

Re: Purple Glass Bowls On Coughtrie Bulkheads?

Are you sure that the glass doesn't have this tint also when it is new? It would be unusual for a glass to turn a purplish colour as it ages, normally they become instead more cloudy, or slightly yellowish or blueish if the colour does change. Possibly it was intentionally made that way, as were the...
by James
Sun Sep 08, 2013 8:53 am
Forum: Lamps
Topic: Has Sylvania SHP SON gone to china???
Replies: 5
Views: 1643

Re: Has Sylvania SHP SON gone to china???

There is a second range of SHP-Basic being made at the Sylvania-Yaming factory in Shanghai, with the focus being on low cost with reduced lifetime and performance. And seeing how high the antiquated barium getter has flashed up into the bulb, life may not be that long at all! It's a pity that too ma...
by James
Sat Aug 10, 2013 6:01 pm
Forum: Lamps
Topic: 18w SOX & 18W SOX E
Replies: 3
Views: 1221

Re: 18w SOX & 18W SOX E

I have seen a few early 18w SOX, and these are different from the later 18W SOX-E in that they have no internal ignition electrode. But I am not sure whether or not the ignition electrode was added at the same time as the name changed. NB the auxiliary electrode is the electrically conductive IR coa...
by James
Sat Aug 10, 2013 5:58 pm
Forum: Lamps
Topic: First Blue LEDs?
Replies: 9
Views: 2740

Re: First Blue LEDs?

First blue LED I saw was also on the dash of my parents VW Golf! It was a 1988 model which they bought in 1991 and I was fascinated by the blue high-beam indicator. I must have asked every local electronics shop at the time if they could get blue LEDs, and all told me they didn't exist, so I also wo...
by James
Sat Jun 15, 2013 1:26 pm
Forum: Lamps
Topic: Anyone know what the largest MA lamp made was??
Replies: 5
Views: 1829

Re: Anyone know what the largest MA lamp made was??

You can see a photo of a 2500W MA/H also on my site at http://www.lamptech.co.uk/Documents/M8C%20MA%20Lamp%20Developments.htm . This was scanned from H.K. Bourne's book on Discharge Lamps and is a prototype model with screw terminal connections. When it was launched for sale, Bipost G38 caps were us...

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