How many bulbs can i run off a 280A Transformer ?

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How many bulbs can i run off a 280A Transformer ?

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20-VOLT-AC		#1 Posted : 18 March 2012 16:52:12(UTC) Retweet
Joined: 27/01/2012(UTC) Posts: 250 Location: united kingdom		Hello Guy's I am going through ideas for a vintage H0 layout and wondered how many lighting accessories i can run from a single 280A super transformer ( Station lamps / lamposts / via the yellow lighting circuit output terminal ? Many regards Neil. 20-VOLT-AC attached the following image(s):
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H0		#2 Posted : 18 March 2012 17:28:13(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,491 Location: DE-NW		Hi, Neil, Modern rule of thumb says 1.5 VA per light bulb. That would be 20 light bulbs from a 30 VA transformer (no power left for anything else). Don't know if those vintage bulbs need more power.
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Bigdaddynz		#3 Posted : 18 March 2012 22:03:52(UTC) Retweet
Joined: 17/09/2006(UTC) Posts: 18,778 Location: New Zealand		I always thought it was 1.0va per bulb. There, you have another 10 bulbs from your 30va transformer, just like that!
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Markus Schild		#4 Posted : 18 March 2012 23:51:36(UTC) Retweet
Joined: 14/01/2006(UTC) Posts: 1,802 Location: Wurttemberg		Hi Neil, The larger type of bulbs, which is used for the lamps you show are specified with a consumption of 1.25 VA. Smaller bulbs like the headlights of locos or the bulbs in Signals of the 704X-Series are specified with 0.9 VA consumption. All 280A transformers should be checked before use today. Often the insulation of the cable (high-voltage-side) has disintegrated inside the transformer. Regards Markus
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20-VOLT-AC		#5 Posted : 19 March 2012 21:43:05(UTC) Retweet
Joined: 27/01/2012(UTC) Posts: 250 Location: united kingdom		Originally Posted by: Markus Schild Hi Neil, The larger type of bulbs, which is used for the lamps you show are specified with a consumption of 1.25 VA. Smaller bulbs like the headlights of locos or the bulbs in Signals of the 704X-Series are specified with 0.9 VA consumption. All 280A transformers should be checked before use today. Often the insulation of the cable (high-voltage-side) has disintegrated inside the transformer. Regards Markus Hi Markus, yes good point on the transformer lead, i always replace the high voltage " MAINS INPUT " cable on old transormers before use and test them on a bench tester for output voltage ! So i should be able to use quite a few bulbs before they start dimming down then ! Has anyone tried using the new low power consumption LEDS which are available with many different socket sizes nowadays ? Thanks Neil.
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kbvrod		#6 Posted : 19 March 2012 23:35:11(UTC) Retweet
Joined: 23/08/2006(UTC) Posts: 2,597 Location: Beverly, MA		Hi Neil,all, See: http://www.trainaidsa.com/shop-leds.shtml and I am sure there are other suppliers out there,... Resistors and diodes,I think your in business,... Dr D


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