OK, I'm an idiot.
I'm trying to create an area-light consisting of 3x3 light sources, but I
can see only one! (Not sure if the looks_like parameter should be applied
for each light source, but at least I expect to see 9 bright spots on the
box!)


=======================
code:

background { Gray70 }
box { <-500, -500, 0>, <500, 500, 1>   pigment { Gray70 } }

light_source { 0, White
    area_light 600 * x, 600 * y, 3, 3
        adaptive 1   jitter   translate < 0, 0, -20 >
        looks_like { whiteBulb } }

camera {
    location <-400, 200, -500>
    right 1.333 * x
    look_at <0 , 0, 010 >
    angle 50  }

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