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post #11 of 55 (permalink) Old 16-10-2016, 16:47
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"Fluorescent"


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post #12 of 55 (permalink) Old 16-10-2016, 17:22
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"Fluorescent"


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post #13 of 55 (permalink) Old 16-10-2016, 18:25
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The TV is VERY voltage sensitive IMO, so it sounds as if the wires to the lights may be the problem, BUT where it splits off I have not got a clue - it could be that at that point there is an "iffy" junction which perhaps simply needs cleaning. Your lights WOULD PROBABLY be wired in parallel and the first one on the chain may be the site of the poor connection..... but I do not know which is the first and thee wiring diagram probably won't help.....

The voltmeter may show a voltage drop, but if it is a poor connection it may be the current getting through rather than the voltage - voltage is the equivalent of the water pressure for water flowing through a pipe, whereas the current (amps) is the equivalent of the volume of water - watts is the power (volts x amps) - think back to an old water wheel, it requires a large volume of water at low pressure, or a smaller volume at high pressure to generate useful power to e.g. grind corn.

So the volt reading may not show a difference if the poor connection simply limits the current that can pass - hence the earlier comment about thin wires - thin wires resist greater current going through....

Not a lot of help, but a poor junction between the bright and the dim ones MAY help you locate it - check the connections on the bright one and ensure they are tight and clean.

I hope.......

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post #14 of 55 (permalink) Old 16-10-2016, 19:16 Thread Starter
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Thanks all (I think )

Ill do some checking over the next couple of days. I suppose like a house maybe rewiring is required after a while. This van is 20 years old now.


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post #15 of 55 (permalink) Old 17-10-2016, 19:52
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I am assuming these units operate off the 12v supply NOT MAINS
If you can get to the light unit terminals than applying a voltmeter with the light switched OFF should indicate the same voltage as at the battery . Now switch the light on and measure again. There will be a difference .
A couple of points though, as fluorescent tubes get older, the light output falls. Probably the inverter ( in the light unit) also gets less efficient. Dont forget that the older fluorescent fittings draw about an amp or so in any case so whilst they are more efficient than filament lamps, they are not particularly effective at converting amps into lumens!

If you can change them to more efficient LED's then you will get more light ( lumens).
Also because they draw less current there will be less voltage drop on the wiring ( even if there is a bad connection somewhere) but it would be best to first check if you do have a connection fault. It may even be a corroded fuse holder somewhere
If you really want to get involved measure the voltage drop from battery to the units ( with them switched on) that should tell you if its a 12v supply problem or just poor earth returns.

Hope this helps and I haven't confused anyone

Mike
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post #16 of 55 (permalink) Old 17-10-2016, 20:30 Thread Starter
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Quote:
Originally Posted by mike800966 View Post
I am assuming these units operate off the 12v supply NOT MAINS
If you can get to the light unit terminals than applying a voltmeter with the light switched OFF should indicate the same voltage as at the battery . Now switch the light on and measure again. There will be a difference .
A couple of points though, as fluorescent tubes get older, the light output falls. Probably the inverter ( in the light unit) also gets less efficient. Dont forget that the older fluorescent fittings draw about an amp or so in any case so whilst they are more efficient than filament lamps, they are not particularly effective at converting amps into lumens!

If you can change them to more efficient LED's then you will get more light ( lumens).
Also because they draw less current there will be less voltage drop on the wiring ( even if there is a bad connection somewhere) but it would be best to first check if you do have a connection fault. It may even be a corroded fuse holder somewhere
If you really want to get involved measure the voltage drop from battery to the units ( with them switched on) that should tell you if its a 12v supply problem or just poor earth returns.

Hope this helps and I haven't confused anyone

Mike
Thanks. I didnt know they had an inverter. (yes they are 12v) The twin one in the bathroom clearly has some circuitry but the single ones dont (or maybe they do). I bet they are the original ones and ancient. Ive not looked yet but you might have hit on something there I suspect as if you remember I changed all the tubes for new ones.


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post #17 of 55 (permalink) Old 17-10-2016, 21:20
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Can't go give you chapter and verse at the moment but I spent a long time last year researching 12v f tubes vs LEDs re lumen for lumen. In the end I was surprised to discover that there was not a great difference between the two efficiency wise. And simply replaced my dim worn out tubes.

Dick
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post #18 of 55 (permalink) Old 17-10-2016, 22:31 Thread Starter
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Originally Posted by Glandwr View Post
Can't go give you chapter and verse at the moment but I spent a long time last year researching 12v f tubes vs LEDs re lumen for lumen. In the end I was surprised to discover that there was not a great difference between the two efficiency wise. And simply replaced my dim worn out tubes.

Dick
I remember you mentioning it which is why I did the same. The issue is not the bulbs clearly though. I do wish (as does Mrs D) that Swift had put a bulb above the toilet seat as its always a bit of a gamble with a dim light behind me whether your aim is right or not. This field has been well watered though.

I did try a stick on battery powered LED light but it fell off mid flow and went straight into the Thetford. I think its probably floating about in the Med by now.


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post #19 of 55 (permalink) Old 18-10-2016, 07:27
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Quote:
Originally Posted by barryd View Post
I remember you mentioning it which is why I did the same. The issue is not the bulbs clearly though. I do wish (as does Mrs D) that Swift had put a bulb above the toilet seat as its always a bit of a gamble with a dim light behind me whether your aim is right or not. This field has been well watered though.

I did try a stick on battery powered LED light but it fell off mid flow and went straight into the Thetford. I think its probably floating about in the Med by now.
I thought your 'work' had given you expertise with Velcro and doudle-sided tape. Clearly that is not the case.

You need 3M VHB double sided tape. I think I'll set myself up as an IT ex-spurt. Maybe.
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post #20 of 55 (permalink) Old 18-10-2016, 09:49
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Have you thought of taking off your Ray-bans?

I've noticed in the winter our ceiling flower ants are very dim due to low temperature and take quite a while to warm up and get to full brightness. Has it got that cold 'oop norf'?
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