Just looking at buying some low voltage lighting from TLC, it says:
"The circuits can be loaded up to the total value of the lamps, not to
the transformer rating as is usual."
What does that mean? The transformer is rated @ 150w does it not mean
i can connect 3x 50w lamps to this circuit using just one transformer? Im
Reading between the lines, I think it refers to the circuit loading on the
They are suggesting that with their premium transformers you count the
mains circuit requirement as the total (low voltage) lamp load, say 100W
for 2 bulbs or 150W for 3, but on an inferior transformer the circuit should
be rated at 150W irrespective of the lamp load (1, 2 or 3). Unless you have
a ceiling full of LV lighting in each room then I don't think it will make much
difference to you and I don't think it affects your application.
However, I would not use any piece of electronics at 100% of its rating for
extended periods as it tends to last faaaaaaaaaaaaaaaaaar longer if it is
say 20% derated. Thus, I would use a 105W transformer to power 2x50W
bulbs, but not a 150W transformer to power 3x50W bulbs.
Thanks Christian, maybe i smoked too much last night as im not entirely sure
what you mean! So you're saying if one lamp blows there may be a voltage
surge to the other two lamps, im not sure how this is relevant to my
question :o( Are you saying i should only use 2 x50w on this 0-150w
Not on this transformer, although you may do so if you wish. It claims that
you can underload it without ill effects. I think it means that some other
makes or designs of transformer must be fully loaded to prevent damaging
FWIW as a fully qualified electrical engineer, tho not of the
electrician variety, it made no sense to me at all.
Probably written by IMM....
It might be voltage stability, it might be power factor...who knows?
Maybe its translated from the Japanese. "Be sure of connecting the
terminal for the rug"
Took me a lot of lateral thinking to work out that in japan. floors are
covered in rugs, and floors are sort of what ground is near, not to
mention earth..or perhaps in japan, they have proper steel mats under
the houses...to do their earthing.
OTOH, when I had to design a basic switch mode power supply from first
principles at university, we had to produce very precise output voltages and
all sorts of input voltages and output currents without wasting much energy.
That's the main point of SMPS.
Precisely, in more ways than one. You cannot rely on an open loop SMPS
system very easily. Not that regulation on 12v LV lamps is particularly
Toroids, wound to sensible magnetic flux levels are remarkably good at
In fact so is any transformer, which is why it's rare for all the bulbs
in your house to go when your neighbours switch theirs off and sneak
upstairs for a bit of nookie while you are stuck reading UK.d-i-y.
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