I have since,
again, modified the lamp holders and fitted 48 LED lamps, MR11 types.
To ensure they
don't fail again I fitted a 10 to 15 volt to 12volt stabiliser. This
circuit can be seen below. It came from a Radio Amateur magazine,
which was designed for charging batteries. I converted the design to
give 12volts output whatever the input voltage was. The reason being
the Leisure battery will give quite a lot of current even when it has
discharged below normal. Just what is needed for wild camping.
So I found I
could get 12volts out at 10 volts in. Or, at 15 volts in I could get
12volts out. The maximum current I found for this design was 1Amp. It
will supply the 3 X 48 LED lamps with no problems. The circuit
was built from parts in my junk box. Improved quality and high gain
components would probably give more current.
You can buy a
similar function power supply, source the internet, for £49.99
I ran the
circuit for a number of hours at maximum current and was pleased to
find the components did not get hot. I did place the Transistors on a
The device was
fitted in series with the cables which fed the lamps. Isolating the
Lamps from the Motorhome 12 volt electrics.
note I am not giving step by step instructions on how to build and
fit, as this modification should only be done by a qualified person<person>
I have used my
constructed device for two years and it has been reliable in use.
MR16 48 3528
SMD LED Bulb<MR16
I have since
sourced and fitted, from EBAY-Hong Kong, May 2011:
MR16 48 3528
SMD LED Bulb Lamp Light Warm White 12V 9W
That's 48 LEDs'
in its body.
below can be integrated using modern components with a higher current rating.
below will give 1Amp, this I have found will drive the 3 X 48 LED
lamps which take 170Milliamps each, about 1/2 an amp. total<total>
The lamps are
so bright, that it is not advised to look at them directly!