There are many sizes of Fresnel lenses, called 'orders', the largest being a first order, which is made up of hundreds of glass prisms. The lenses decrease in size through second order, third order, etc.Some have red panels, in order to shine a red light seaward.here are many sizes of Fresnel lenses, called 'orders', the largest being a first order, which is made up of hundreds of glass prisms. The lenses decrease in size through second order, third order, etc.