# question MR11 to MR16

#### xMrIS

Hi,

I have 10 MR11 (halogen 20w each) but ordered -online- by mistake MR16 LEDs (4.5w each)
another problem is that I can't reach the transformer - so no idea what is the wattage of it,
but I assume its minimum 200w as all of the halogens are 20W and I am using them for years...(installed by
some previous owner of the house).

What a friend told me and I later read it on the net is I "can't" use those 4.5w as in fact they consume more
power ..? Its something I can't understand.. isn't 10x4.5 = 45watt the whole? Can someone pls help me there?

You are correct, 45 watt total so if the power supply can give that low of an output then should be no problem. Depends how old, if a real transformer no problem if it's an electronic transformer may be it will not work with such a low output.

aha that's it then, nothing like they are consume in fact "more" power..
thank you very much for that, now I got it.

I think I can solve the low power requirements if I leave 1 or 2 of the old halogens, even say I will replace 8 of them I will have 20+20+(8x4.5)=76w way less than the 200w that is now and in the future I will try to
find and replace the transformer

If it is one 200w electronic unit, then its likely to have a minimum load of 40w maybe 60w.
If there cabinet lights its possibly 2 or more units maybe 105watt maximum units.
the smaller units tend to have a 20 watt minimum.

Many dont tend to use one big 200w unit as the lampholder wires are generally thin and in the event of a short circuit, the cable insulation can sometimes melt before the units internal short circuit protection operates.

Last edited:
Thanks mate for this info, downlights in kitchen.

Once, while tying to change one of them I accidentally disconnected a cable and the rest of the 5 lights stopped
working, so I assume all of them are chain-connected to one transformer -or maybe I am wrong and is just 4 of them on one TX and the rest 6 on the other... . but anyway I will install today the LEDs - bases fit , its the universal MR11/MR16 type, just a testing before I will go to buy the bigger brackets.

please let us know how you get on, Leds and transformer compatibility can be a pain unfortunately

all of the LEDs are working fine! it seems the 45w are inside the minimum requirements of the transformer(s)

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