Now i am sure that most of you know you can buy decent LED replacement bulbs on eBay, that will replace a 21w bulb. However that is not as much fun as building your own units.
Now this is a very simple method using cheap materials. as always i try not to over complicate things,
you need;
-4 8mm 0.5w strawhat LED's per light
-a piece of semi-rigid plastic to cut 35mm discs out of (i.e. ABS)
-soldering iron and solder
-drill and drill bits
-small nut and bolt (M4-M6)
-wood chisel
-heat shrink sleaving 4mm
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Just a thought.
- to make it as simple as possible for novice builders
- using resisters wastes energy if they are not needed, i know its not alot of energy but its the Principle.
- if one did fail you would want replace it whether in parallel or series
i hope that explaines my thinking, it is good practice to use resissters where the project requires it and i do use them in other projects.
builders should always check carefully the voltages of there LEDs and use them wisely using and series LED calculator to double check there sum's!!
thanks for the comment
Sparky