Signals

THE SIGNAL BOX


Railway signalling discussion

SL29 indicator bulbs 12V 2.4W

Technical talk on signalling matters

SL29 indicator bulbs 12V 2.4W

Unread postby John Webb » Tue Apr 24, 2012 9:31 am

We've now got our new simulator working at St Albans South, but with many more indicators now lit, we find that we're running out of the SL29 12V 2.4W bulbs they use. Can anyone tell us the best source to go to for a dozen or so of these to give us some spares in hand, please?
John Webb
(Member, St Albans Signalbox Trust)
User avatar
John Webb
Main line box
Main line box
 
Posts: 1825
Joined: Tue Jul 8, 2008 1:22 pm
Location: St Albans, Herts

Re: SL29 indicator bulbs 12V 2.4W

Unread postby Fast Line Floyd » Tue Apr 24, 2012 10:14 am

I dread to think what they will charge you but http://ceaglighting.co.uk/ViewProduct.aspx?productId=3173
list them along with all other signalling lamps.

Graham
Graham
User avatar
Fast Line Floyd
Main line box
Main line box
 
Posts: 1634
Joined: Tue May 26, 2009 11:42 am
Location: Raunds

Re: SL29 indicator bulbs 12V 2.4W

Unread postby S&TEngineer » Tue Apr 24, 2012 11:23 am

John, There is an approved LED equivalent. I will dig out the details for you. Although the initial cost may be higher they should last a lifetime :wink:
Regards,
S&TEngineer
-----------------------------------------------------
Out of this nettle, Danger, we pluck this flower, Safety.
Henry IV, Part 1, Act 2, Scene 3
User avatar
S&TEngineer
Moderator
Moderator
 
Posts: 1602
Joined: Fri Nov 9, 2007 8:17 pm
Location: Somewhere in the far South West

Re: SL29 indicator bulbs 12V 2.4W

Unread postby John Webb » Tue Apr 24, 2012 5:21 pm

Gentlemen, thanks for your help.
John Webb
(Member, St Albans Signalbox Trust)
User avatar
John Webb
Main line box
Main line box
 
Posts: 1825
Joined: Tue Jul 8, 2008 1:22 pm
Location: St Albans, Herts

Re: SL29 indicator bulbs 12V 2.4W

Unread postby S&TEngineer » Tue Apr 24, 2012 8:30 pm

Here you go. I once used these at Penzance and other Cornwall boxes: http://ds.leds.co.uk/ds/231series.pdf
Warning: They can be very bright and you may need to put a filter in the indicator window :lol:
Regards,
S&TEngineer
-----------------------------------------------------
Out of this nettle, Danger, we pluck this flower, Safety.
Henry IV, Part 1, Act 2, Scene 3
User avatar
S&TEngineer
Moderator
Moderator
 
Posts: 1602
Joined: Fri Nov 9, 2007 8:17 pm
Location: Somewhere in the far South West

Re: SL29 indicator bulbs 12V 2.4W

Unread postby John Webb » Tue Apr 24, 2012 9:07 pm

Thanks, Chris. I note that the info sheet you link to is for 15s not 15d bases - but it's given me the idea for a couple of other sources I can look at.
John Webb
(Member, St Albans Signalbox Trust)
User avatar
John Webb
Main line box
Main line box
 
Posts: 1825
Joined: Tue Jul 8, 2008 1:22 pm
Location: St Albans, Herts

Re: SL29 indicator bulbs 12V 2.4W

Unread postby S&TEngineer » Tue Apr 24, 2012 9:23 pm

......Whoops wrong link. It should have been this one for 12v http://ds.leds.co.uk/ds/240series.pdf
Regards,
S&TEngineer
-----------------------------------------------------
Out of this nettle, Danger, we pluck this flower, Safety.
Henry IV, Part 1, Act 2, Scene 3
User avatar
S&TEngineer
Moderator
Moderator
 
Posts: 1602
Joined: Fri Nov 9, 2007 8:17 pm
Location: Somewhere in the far South West

Re: SL29 indicator bulbs 12V 2.4W

Unread postby John Webb » Wed Apr 25, 2012 10:14 am

Ta!
John Webb
(Member, St Albans Signalbox Trust)
User avatar
John Webb
Main line box
Main line box
 
Posts: 1825
Joined: Tue Jul 8, 2008 1:22 pm
Location: St Albans, Herts

Re: SL29 indicator bulbs 12V 2.4W

Unread postby Alistair Larter » Wed Apr 25, 2012 6:51 pm

I have recently purchased some repeaters and some have them have 24volt 5 watt fitted. These give a similar brightness when run on 12 volts. The 24volt bulbs are readily available from any commercial garage supplier. I have also used 12volt 5watt with no issues with brightness or over heating.
User avatar
Alistair Larter
Branch line box
Branch line box
 
Posts: 270
Joined: Mon Jun 14, 2010 8:33 pm
Location: East Yorkshire

Re: SL29 indicator bulbs 12V 2.4W

Unread postby marka108 » Sat Jan 7, 2017 2:48 pm

Gents just to resurrect a very old thread, i was looking for these bulbs and google threw up this page, i have had no luck finding the 2.4watt bulbs however there are plenty 12v 5w bulbs and don't seem to cause any over heating problems, they are also very cheap for a pack of 10. there are led replacements available but i do not wish to pay the price for them.

standard bulbs here. http://www.ebay.co.uk/itm/121622998216? ... EBIDX%3AIT

led replacement here. http://www.ebay.co.uk/itm/142226595058? ... EBIDX%3AIT
pulling a 100yard semaphore off is easy right?
marka108
Trainee
Trainee
 
Posts: 6
Joined: Sat Dec 17, 2016 4:39 pm
Location: fife

Re: SL29 indicator bulbs 12V 2.4W

Unread postby John Webb » Sun Jan 8, 2017 8:45 am

marka108 wrote:Gents just to resurrect a very old thread, i was looking for these bulbs and google threw up this page, i have had no luck finding the 2.4watt bulbs however there are plenty 12v 5w bulbs and don't seem to cause any over heating problems, they are also very cheap for a pack of 10. there are led replacements available but i do not wish to pay the price for them.

standard bulbs here. http://www.ebay.co.uk/itm/121622998216? ... EBIDX%3AIT

led replacement here. http://www.ebay.co.uk/itm/142226595058? ... EBIDX%3AIT


Thanks - we got some bulbs without any problems back in 2012, and so far have not needed any more.
John Webb
(Member, St Albans Signalbox Trust)
User avatar
John Webb
Main line box
Main line box
 
Posts: 1825
Joined: Tue Jul 8, 2008 1:22 pm
Location: St Albans, Herts

Re: SL29 indicator bulbs 12V 2.4W

Unread postby Fast Line Floyd » Sun Jan 8, 2017 6:54 pm

marka108 wrote:Gents just to resurrect a very old thread, i was looking for these bulbs and google threw up this page, i have had no luck finding the 2.4watt bulbs however there are plenty 12v 5w bulbs and don't seem to cause any over heating problems, they are also very cheap for a pack of 10. there are led replacements available but i do not wish to pay the price for them.

standard bulbs here. http://www.ebay.co.uk/itm/121622998216? ... EBIDX%3AIT

led replacement here. http://www.ebay.co.uk/itm/142226595058? ... EBIDX%3AIT

Car side and tail lamp bulbs are not suitable for use in signal repeaters because the two bayonet lugs on car bulbs are off set at different heights from the base (so as to ensure that when you turn on the side lights you don't get the brake light instead) and the two solder terminals at at the bottom each feed one of the filaments with the case being the common connection. The shelf repeaters used on the railway require the lugs at equal height from the bottom.
Graham
User avatar
Fast Line Floyd
Main line box
Main line box
 
Posts: 1634
Joined: Tue May 26, 2009 11:42 am
Location: Raunds

Re: SL29 indicator bulbs 12V 2.4W

Unread postby Alistair Larter » Sun Jan 8, 2017 8:31 pm

Graham. I think you have mistaken brake, tail lamps with the small 12v 5w double contact bulb which do fit perfectly and have equal pins with both contacts feeding the element. The bulb you described is used for brake tail and does have off set pins and the contact arrangement you described.
User avatar
Alistair Larter
Branch line box
Branch line box
 
Posts: 270
Joined: Mon Jun 14, 2010 8:33 pm
Location: East Yorkshire

Re: SL29 indicator bulbs 12V 2.4W

Unread postby John Hinson » Sun Jan 8, 2017 9:39 pm

Commercial vehicle bulbs will have twin terminals (because they don't use common return like a car does) and are generally a 24v system so you should be able to obtain these in all shapes and sizes.

John
Image
‹(•¿•)›
User avatar
John Hinson
Site Admin
Site Admin
 
Posts: 6840
Joined: Thu Nov 8, 2007 1:13 pm
Location: at my computer

Re: SL29 indicator bulbs 12V 2.4W

Unread postby Fast Line Floyd » Mon Jan 9, 2017 1:52 pm

Alistair Larter wrote:Graham. I think you have mistaken brake, tail lamps with the small 12v 5w double contact bulb which do fit perfectly and have equal pins with both contacts feeding the element. The bulb you described is used for brake tail and does have off set pins and the contact arrangement you described.

I read the post as it being a tail and brake bulb for a car but most single filament car bulbs do use the case as the return contact having only a a single centre contact on the bottom anyway.

John Hinson wrote:Commercial vehicle bulbs will have twin terminals (because they don't use common return like a car does) and are generally a 24v system so you should be able to obtain these in all shapes and sizes.

John

Indeed I stand corrected here I wasn't aware of that although it does make sense to prevent silly mistakes between 12v and 24v systems.
Graham
User avatar
Fast Line Floyd
Main line box
Main line box
 
Posts: 1634
Joined: Tue May 26, 2009 11:42 am
Location: Raunds

Next

Return to S&T Department

Who is online

Users browsing this forum: No registered users and 6 guests