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NO BUZZING PLEASE! (Read 18491 times)
Lectrician
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Re: NO BUZZING PLEASE!
Reply #17 - Aug 13th, 2004, 8:18pm
 
Electronic trans need derating by 15% when i last read a dimmer instruction leaflet.  Maybe diferent manufacturers have different tollerences.
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ban-all-sheds
Re: NO BUZZING PLEASE!
Reply #18 - Aug 14th, 2004, 10:45am
 
[quote author=Lectrician  link=1092214325/0#11 date=1092329564]Dont like LV then BAS  Grin [/quote]
No - I do like LV.   It's ELV that I don't like  Grin


Quote:
- 90% of heat fires backwards from the bulb, so cool to the front.

This is to do with the lamp design, dichroic vs PAR, not the voltage, and you can get both types in mains lamps, so you have the choice.   In a ceiling, heat coming out forwards is not usually a problem, whereas a lot of heat going back into the luminaire might be, so this choice is a good thing...

Quote:
- Light colour rendering is excellent, pure white.

There's not a great deal of difference - if you didn't have both types next to each other to compare, then I don't think you'd ever look at a mains halogen and think "oo-err, that's not very white".   They are all a great deal better in this respect than traditional incandescents.

Quote:
- LV lamps last longer

Not always true. Different manufacturers at different price points quote different lives. In both cases it's a spread of lengths with a lot of overlap. Some mains halogens are longer lived than some 12V ones, and in a lot of cases the differences are so small that if you were concerned about them you'd not be using halogen lighting in the first place.

Additionally, dimming can be troublesome - you have to select an appropriate dimmer and you also have to ensure that the transformer is suitable for dimming - more complication, not less. And even then, there's a reasonable chance that the transformer will generate an annoying buzz when dimmed.

And good quality transformers are not cheap.

Finally - future proofing. LED lamps are getting better and cheaper all the time - they're already up to 20-30w equivalence, and the hugely increased life already more than compensates for their higher price. With mains luminaires you can just plug them in. With 12V ones you'll run into problems with underloaded transformers, as the actual consumption of these lamps is in the 1-2W range.



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Re: NO BUZZING PLEASE!
Reply #19 - Aug 14th, 2004, 12:31pm
 
Thanks ban-all-sheds Cheesy

That's shone a little more light on the subject (sorry, poor pun) Grin

However I’m still confused, mains is straight forward enough 240v Wink

But what’s the dif between LV & ELV ???

Thanks Smiley
Dusty Cheesy
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Re: NO BUZZING PLEASE!
Reply #20 - Aug 14th, 2004, 12:59pm
 
LV is below 1000v and I think ELV is below 50v but I'd have to look it up to be sure.
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Re: NO BUZZING PLEASE!
Reply #21 - Aug 14th, 2004, 3:01pm
 
a lot of people especially diyers and *MANUFACTURERS* say LV (low voltage) when they  mean ELV (extra low voltage)

i would imagine not many people use HV supplies in the home Wink
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Re: NO BUZZING PLEASE!
Reply #22 - Aug 14th, 2004, 3:49pm
 
It becomes even more confusing when you consider that electronic equipment (eg television) voltages are referred to as LT,HT,and EHT. When it comes to cars the spark plug voltages roughly correspond to EHT in a tv yet are invariably referred to as HT. Roll Eyes
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Re: NO BUZZING PLEASE!
Reply #23 - Aug 15th, 2004, 1:14am
 
well that post I have to say was brilliant BAS.

the subject of voltages is best understood once you apreciate that 230 Volts is actualy very small, we can go up to hundreds of thousands of volts, and hence anything below 1000V/1kV A.C. and 1500 D.C is considered Low Voltage

anything below 50V SELV or whatever is considered Extra Low Voltage/ELV, which is what most modern outdoor Christmas Light sets say on them!

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Lectrician
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Re: NO BUZZING PLEASE!
Reply #24 - Aug 15th, 2004, 8:45am
 
Even us sparks break the rules and call them LV - slapped wrists Smiley

When i walk into a room, and someone says "can you stick a couple more downlights in", i can tell if they are LV or ELV without getting the steps out - the mains ones are a warmer colour.  Maybe its just me Smiley

I love the ELV, the dichroic reflector gives a great effect with a tinge of colour aswell.
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Re: NO BUZZING PLEASE!
Reply #25 - Aug 15th, 2004, 12:30pm
 
well I jus had a customer put in mains halogen downlights GU10 lamps and didn't like them compared to the ELV ones she had in her bathroom

we changed the lamps to GZ10 she still wasn't happy

so now she has ELV same as the bathroom
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Re: NO BUZZING PLEASE!
Reply #26 - Aug 16th, 2004, 1:30pm
 
[quote author=L.Spark  link=1092214325/15#23 date=1092528855]well that post I have to say was brilliant BAS. [/quote]
Is that another pun??  Wink
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Re: NO BUZZING PLEASE!
Reply #27 - Aug 16th, 2004, 1:33pm
 
[quote author=triumphman  link=1092214325/15#22 date=1092494968]It becomes even more confusing when you consider that electronic equipment (eg television) voltages are referred to as LT,HT,and EHT. When it comes to cars the spark plug voltages roughly correspond to EHT in a tv yet are invariably referred to as HT. Roll Eyes [/quote]
Word of warning to any old-timers contemplating DIY work on cars - with modern ignition systems, the T has got a lot more H.   No longer a case of "F*** that hurt!", can be "Oh my God he's dead!".

Oh no.   I'm turning into MB......  Lips Sealed
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LSpark
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Re: NO BUZZING PLEASE!
Reply #28 - Aug 19th, 2004, 3:34am
 
yes, we dont have Millenium boy, or ChubbyRegsWise on our forum, well maby its a bit Chubby here, but mostly not so  Wink

Shall we diet?  Cheesy
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Re: NO BUZZING PLEASE!
Reply #29 - Aug 19th, 2004, 11:13am
 
I'd be all in favour of a crash diet to remove all trace of Chubbiness.
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LSpark
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Re: NO BUZZING PLEASE!
Reply #30 - Aug 20th, 2004, 11:30am
 
Thats my thinking BaS  Wink


when shall we start?   Cheesy Cheesy Cheesy
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Re: NO BUZZING PLEASE!
Reply #31 - Aug 22nd, 2004, 12:27am
 
Sets a nasty precedent.   Once you start doing that, where do you stop?
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Re: NO BUZZING PLEASE!
Reply #32 - Aug 22nd, 2004, 2:14am
 
bah!, chubby cleansing!  Grin
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