Advice please ,fitting LED rear spotlight to old Ford3910H?

[Pilatus]

Now we are into dark late afternoons and early evenings , I wish to fit a LED light to a roof bracket on my old Ford 3910H, to illuminate part of the shed where I use my firewood processor. Ideally I just want buy an LED light that will bolt straight on to the roof bracket that has a hole drilled through it ,and connect the flex from the LED light into the small three pin plug that is fitted on the back of the tractor. Do LED lights use much electrical power . I have know knowledge of vehicle electrics so I may wishful thinking!!!!
Any advice suggestions much appreciated.

 

[Kevm]

No they don't use much at all, that is the beauty of them, get a cheap one off ebay, bang it on connect it up, sorted.

 

[Exfarmer]

That 3 pin plug will nave 2 positives and one negative.
one positive goes through the ignition and is always best used in this situation as it avoids leaving the light on and draining the battery.
I personally would not buy the cheapest as they can have limited life but any motor factor should have a reasonable product for not Much money.