Most mag lights are only 3 diopter (1.75 power). The 5 diopter (2.25X) lights help when you need more magnification. Here is a source for a rectangular lens version. http: // www howardelectronics.com/xytronic/worklight/html You can google search for 5 diopter mag light and get more sources. The focal length of the 3 diopter is 13" while the 5 diopter is 8". I use a 3 diopter mag light with 3 power reading glasses due to my poor vision. You need to be sure the light you purchase has a protective cover over the blub or a stray wire clipping can break it all too easily.
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