Since you didn't say exactly what you're trying to light or the parameters, I can only say that if this is general lighting, one concentrated light source will seem more harsh than that which is spread out. A light source too close to the ground will be less effective than one higher placed. Most screening to combat a neighbor's light source occurs at the lot line.

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This is to light up/decorate backyard of size over 3000 sq ft with most stamped concrete patio. The posts will be about 12 ft inside from the fence with fruit trees and palms along the fence.

Your reply made me think about two concentrated light sources. The posts will look good during daytime complementing the concrete patio but not sure when they are lit unless I go with low intense bulbs. May be I should go with single head light? I am thinking now. Thanks for the reply.

Here is a link that might be useful: Light Post

I would advise that you take some "work" lights on long extension cords outside at night and experiment with various lighting positions and number of sources. You'll see what a huge difference moving lights around and different light levels will make. Play with it. When you achieve an effect you like, try to recreate it with permanent lighting. I always prefer light EFFECTS that are visible rather than the light sources themselves.

It would help to see the style of your home and back patio area. The style of the lampposts is sort of mini-Victorian street light, rather a Disneyesque Main Street look. If you can get outside the big box and try a specialty lighting store, you will have more options. Good lighting isn't usually "in your face", but more subtle -- as Yard said, you'll see the lighting effects, not so much the fixture.

I think you would benefit from reading one or all of Randall Whiteheads books on Outdoor lighting.

http://www.randallwhitehead.com/books_etc/book_outdoor.php

Unless you are going for a disneyland look or you are lighting a commercial property, lamp post lighting is not a very pleasing light to have in a residential back yard.

Here is a link that might be useful: randall whitehead