Bob, these LED's have a 25 degree viewing angle, giving me roughtly 8-9" circles of light at the bottom of the tank, mine are about 6" over the water and then it's 24" to the bottom of the 180g tank.
If you find the LED's to be too intense for your tank, try roughing up the lens a bit with sandpaper, that will help diffuse the light.
The problem is .pdf format is not always rendered by folks' browsers, so I converted it to .jpg and attached it. Since I know the conversion makes for a little distortion I've uploaded your original PDF file to our server which can be downloaded through the link.
