Transformer

[KEVINDOE]

Hi all,
I have a transformer with three 50va connections on secondary side , is ther any way i could run five 20watt downlighters from this, it is already in situ so if poss i weould use it , any thoughts??

 

[AA410]

Cant you put an other next to it to take you upto what you want

 

[dichroic]

All types of incandescent lamps, including GLS (general lighting service) lamps, incandescent reflector lamps and tungsten halogen lamps, have unity power factor, as they are purely resistive. Therefore, the connected load in VA of an incandescent lighting load is equal to the sum of the lamp watts.

Regards

Dichroic

 

[roluxled]

Noop, 3 lights will be over loaded..suggest you only connect 2 lights, and keep the 3rd. one remaining..

 

[ghost]

I agree with electro, the tranny is rated at 150VA and you want to load 100VA, therefore ok. Make sure you use suitable size flex to supply the lamps, I would use 2 core 1.5mm, depending upon the length of runs.
Now, my only issue with this is when some muppet comes along in the future and replaces the 20W lamps with the the more readily available 50W lamps. The tranny will fry.
This is why I like to fit either 240V dichoric or energy saving downlighters, if the spec is 12V I fit individual trannys.

 

[davelerave]

I personally agree with ghost, why unless stated do people still use transformers? Just something else to go wrong. 230V GU10 evertime, that way the only fault you can get is the lamps.

better light and less bulb trouble with 12v 50w halogen ,less severe on dimmers


the 230v gu-10 gives more options alright

 

[Andyfm]

I had to look into this a couple of years ago for a picky customer, and apparently the light output is 10-15% more from a 12v than a 240v, don`t know about the dimmer though.
And also the options on beam angles etc is better with 12v

 

[davelerave]

I have never noticed a better light from low voltage lamps nor any difference in lifespan.
Why are they less severe on dimmers? I know some transformers offer a soft start feature, but in the long run they all draw the same current.

i imagine the inrush will be less severe with an electronic trafo than a gu10 halogen


i forget the detail after a while unfortunately


the mains lamps will be subject to overvoltage and surges more than the electronic 12v i think also