| http://www.w3.org/ns/prov#value | - ns is the angle u and the largest cross sectional dimension of said light spot is D, and D is less than or equal to said smaller dimension N, and wherein L, N and u are related by the equation, L=k*N/tan (u), wherein k is a constant in the range of about 1.5 to 3; and, a light valve having an active area, said valve disposed at said exit end to receive, on said active area, light transmitted by sa
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