Search found 339 matches

by Tom
Sun Aug 12, 2018 1:35 pm
Forum: Control Gear
Topic: Ballast for 14W t12 tube
Replies: 12
Views: 602

Re: Ballast for 14W t12 tube

Never known it to have much an affect on lifespans. I don't think Thorn would've spec'd it if tube life and performance was compromised. (The gear in the original 15w Viewpoint shaver light is a 20w QuickStart ballast) Can't be any worse than running a 6w T5 or even a 4w on an 8w ballast which again...
by Tom
Sun Aug 12, 2018 10:37 am
Forum: Control Gear
Topic: Ballast for 14W t12 tube
Replies: 12
Views: 602

Re: Ballast for 14W t12 tube

For many years it was common practice to run 15w tubes on 20w ballasts here. It's even listed in the old Thorn catalogues and Thorn even marked some ballasts as 15/20w. So there shouldn't be any harm in running the 14w on a 15w ballast. I wonder if the 28w 2D ballast would be good for running a seri...
by Tom
Thu Aug 02, 2018 5:08 pm
Forum: Luminaires
Topic: Help me Identify a Fitting from my Past...
Replies: 2
Views: 86

Re: Help me Identify a Fitting from my Past...

That sounds like a really bizarre sounding fitting Zel! Never seen or heard of such a thing! I did once see something that resembled what may have been a single Coughtrie SFB style 13w bulkhead, but that would've been far too slim to house an 18w SOX! Cool idea tho, a tungsten standby/runup lamp!
by Tom
Wed Jun 20, 2018 3:14 pm
Forum: Control Gear
Topic: Ballast for 14W t12 tube
Replies: 12
Views: 602

Re: Ballast for 14W t12 tube

A 15w ballast is probably your best option TBH. The 14w T12 was originally filament lamp ballasted so may be worth investigating what lamp would be the best match. I've seen 14w T8 aquarium tubes on sale in the past but I'm pretty sure they would be running on 15w gear.
by Tom
Sun Jun 17, 2018 6:42 pm
Forum: Lamps
Topic: The Nernst Lamp
Replies: 3
Views: 526

Re: The Nernst Lamp

What an interesting concept! I believe it was quite short lived and was soon displaced by both incandescent arc and discharge lamps?
by Tom
Mon Jun 11, 2018 9:35 pm
Forum: Lamps
Topic: SON-I Snapstart Lamps - 2 Stage Run-Up?
Replies: 1
Views: 218

SON-I Snapstart Lamps - 2 Stage Run-Up?

This is a SON phenomema I haven't seen in over 30 years but I wonder if anyone has witnessed this too? Back in the mid 80s, my school sports hall was lit with 250w SON-E low-bays with deep polycarbonate bowls. The lamps must have been the internal thermal snapsart type (bimetal strip and heater coil...
by Tom
Fri May 18, 2018 9:48 am
Forum: Street Lighting
Topic: [repost] Amber minor restoration project!!
Replies: 64
Views: 4555

Re: [repost] Amber minor restoration project!!

Great stuff! Looking good. Certainly a timeless classic!
by Tom
Sat Apr 14, 2018 11:25 am
Forum: Street Lighting
Topic: [repost] Amber minor restoration project!!
Replies: 64
Views: 4555

Re: [repost] Amber minor restoration project!!

This really is shaping up superbly! Regarding internal cabling, Tri Rated Switchgear wire is your best bet, in 0.5mm or 0.75mm. (all sizes available right up to 25mm!) It's heat resisting at 105C and available in several colours, including the aforementioned red and black for old school authenticity...
by Tom
Wed Oct 04, 2017 6:03 pm
Forum: Control Gear
Topic: Correct Capacitor List
Replies: 16
Views: 6305

Re: Correct Capacitor List

I do find it quite interesting the huge contrasts in different capacitor ratings between lamps, even of the same wattage. We have 13-18uf caps for 250w mercury circuits yet the 250w SON needs 30uF! Old catalogues from the 50s, for say, a 4ft 40w switchstart circuit list a 3.25uF cap yet an 18" ...
by Tom
Fri Jul 21, 2017 9:19 am
Forum: Lamps
Topic: Coloured Metal Halide Lamps
Replies: 8
Views: 2068

Re: Coloured Metal Halide Lamps

I know exactly what you mean about installation designs that initially spec'd coloured halides. There's a posh estate agents down my way that had magenta lamps lighting the front of their building that looked funky by night. Now they're just regular lamps! Coloured lamps never seem to get replaced l...
by Tom
Tue Jul 18, 2017 2:45 pm
Forum: Lamps
Topic: Coloured Metal Halide Lamps
Replies: 8
Views: 2068

Re: Coloured Metal Halide Lamps

What I find quite amazing is the fact that coloured metal halide lamps came about as a result of early developments where rapid depreciation of elements such as Lithium, leaving a predominant dose of Thallium or Indium behind, resulting in the distinct green or blue light. I believe GEC were one of ...
by Tom
Wed Apr 26, 2017 11:18 am
Forum: Lamps
Topic: Short Lived Oven Lamps!
Replies: 1
Views: 840

Short Lived Oven Lamps!

Has anyone else been experiencing premature lamp failures in their ovens at home? I'm referring to the 300c rated 40w E14 G45 jobs. We've had both Polish made Philips and Chinese made Osram pearl variants and never get more than a few months service from them! All the lamps I've seen have the standa...
by Tom
Mon Feb 20, 2017 11:25 pm
Forum: Lamps
Topic: Narva Quits The Fluorescent Market
Replies: 12
Views: 3049

Re: Narva Quits The Fluorescent Market

Heartbreaking stuff. They're trying their best to get fluorescent confided to the history books by the look of things! As far as Chinese lamps go, BELL are the way forward!
by Tom
Tue Feb 14, 2017 9:54 pm
Forum: Lamps
Topic: Narva Quits The Fluorescent Market
Replies: 12
Views: 3049

Re: Narva Quits The Fluorescent Market

Oh man this is NOT good news!! Just when it looked like quality tubes would stick around for a little while yet! Our only hope now is Philips keeping their production coming from Poland but that's not sounding too good either as Philips have been making noises about exiting the fluorescent market fo...
by Tom
Thu Nov 17, 2016 5:29 pm
Forum: Luminaires
Topic: Thorn Popular Pack c1970s
Replies: 20
Views: 6900

Re: Thorn Popular Pack c1970s

Totally agreed! Welcome to ATL Brite Spark! Strange to think we all thought we were alone in this great hobby and interest only we would understand! What's even more strange to think about, is the fact the T12 PP design is approaching fifty years old! It was around 1967-68 I think the first incarnat...
by Tom
Sat Oct 08, 2016 5:30 pm
Forum: Lamps
Topic: Osram 125w HQL Super Deluxe 'Golden Eggs' On Amazon
Replies: 1
Views: 1586

Osram 125w HQL Super Deluxe 'Golden Eggs' On Amazon

As brought to our attention by Andy over on the gallery, a fantastic opportunity to own 125w editions of the famous MBF Super Deluxe lamps with the golden filter coat. The hallowed 'Golden Egg'! 80w and 50w versions also available. Can be found by searching Osram HQL on Amazon. There's even a 250w a...
by Tom
Fri Sep 23, 2016 4:27 pm
Forum: Lamps
Topic: The Philips CorePro LED PLC Lamp
Replies: 5
Views: 2117

Re: The Philips CorePro LED PLC Lamp

It's kind of sad that Philips have designed an LED replacement for the very lamps they invented! But on the other hand, all credit to Philips for developing lamps that are compatible with existing gear including HF and emergency without modification! That would've taken some pretty serious circuitry...
by Tom
Wed Aug 10, 2016 6:29 pm
Forum: Street Lighting
Topic: Interested In Light Pollution?
Replies: 2
Views: 2115

Re: Interested In Light Pollution?

Will be interesting to see the map in a few years when LED has taken over....
by Tom
Fri Jul 15, 2016 3:12 pm
Forum: Lamps
Topic: Help Identifying Lamps
Replies: 9
Views: 2406

Re: Help Identifying Lamps

Appears to be the 25w Rough Service (reinforced filament construction) version too. Good find! Often used as a 'headlight' in upright vacuum cleaners of the 60s and 70s. I Once had a Hoover branded GEC 25w SBC pygmy!
by Tom
Tue Jun 07, 2016 8:58 pm
Forum: Luminaires
Topic: Superslim Lampholders
Replies: 8
Views: 2602

Re: Superslim Lampholders

Sounds a good plan!
by Tom
Sun Jun 05, 2016 6:05 pm
Forum: Luminaires
Topic: Superslim Lampholders
Replies: 8
Views: 2602

Re: Superslim Lampholders

They're made of hard urea/Bakelite type plastic so should be fairly immune to stripping methods. I'd try steaming them too!
by Tom
Wed Mar 09, 2016 9:32 pm
Forum: Street Lighting
Topic: Thorn Beta 6 Bowls
Replies: 3
Views: 1798

Re: Thorn Beta 6 Bowls

Would the bowl from the Australian Stradalux fit? May be worth contacting the guys downunder? Sadly I'm not lucky enough to own a Beta 6 either, let alone a bowl!
by Tom
Thu Feb 18, 2016 11:13 pm
Forum: Control Gear
Topic: EOL Tubes On Thermal Starters?
Replies: 3
Views: 2659

EOL Tubes On Thermal Starters?

Has anyone ever witnessed a tube failing on a thermal 4 pin switchstart circuit? I'm just curious to whether the rectifying lamp would still pass enough current to keep the heater coil and contacts open, allowing the tube to shimmer away. Or would the rectifying tube cause the starter to cool down r...
by Tom
Sun Feb 07, 2016 3:42 pm
Forum: Street Lighting
Topic: 70s Street lighting Vid
Replies: 6
Views: 2484

Re: 70s Street lighting Vid

Great bit of footage! Loved seeing all the old streetlights and vehicles! Note the distinct lack of pedal cyclists.... Back when people had sense! Come another 45 years there'll be no shortage of dash cam and Go-pro footage of London and we'll all look back on just how stupid some cyclists were! But...
by Tom
Thu Feb 04, 2016 1:00 am
Forum: Lamps
Topic: Does anyone use indandescent GLS anymore?
Replies: 14
Views: 4467

Re: Does anyone use indandescent GLS anymore?

Only GLS we have here is a BC 100w Crown Silver in the spare room....

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