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Fresnel lenses have been produced in various different sizes, commonly referred to as "orders". The order chosen for any particular lighthouse varies, depending on the strength of light required as well as the dimensions of the lighthouse's lantern room. The classification of a lens is determined by the focal distance, which is the distance from the inside surface of the lens to the center of the light.

Lens Stats
Order Classification Approximate Diameter (in inches) Approximate Height (in feet)
1st 72 8
2nd 55 6
3rd 39 5
3 1/2 29 4
4th 19 2 1/2
5th 14 2
6th 11 1 1/2