what is the brightest outdoor lighting?

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1. Lightening, it lights up the entire sky.
2. The Sun.
3. (m) goto the following website for outdoor lighting http://shopping.msn.com/results/shp/?bCatId=5040,av=12-90008
4. Metal-halide lamps are bright white. A 1000 watt light is pretty darn bright. This, of course, would be a pretty big residential light. They are normally used for something like parking lot or maybe stadium lights.
5. natural source LIGHTENING AND SUN artificially MERCURY VAPOUR LAMP