1) First we (Tom the wood-shop monitor and I) tested the light with a photography light meter. The light consistently covered an area of 12"x36", which made me rethink my original design (more on that later).
2) When I got home I tested the light again with treated papers underneath. I put a negative in the center to test exposure:
3) The results-- notice the lighter edges:
4) Checking value with another cyanotype:
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