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One of the easiest ways and very unobvious is to buy a 400 w
hps security light ( say for dads business , they dont know.
When you pick it up seperate the ballast from it using an angle grinder and add a 3 core wire extension ( heavy duty ) from the ballast to the bulb holder , fold out the reflective foil in the light casing and voila you have a functional 400 w hps..
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