/usr/share/gem/examples/03.lighting/02.light.pd is in gem-doc 1:0.93.3-5ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | #N canvas 253 63 751 605 10;
#X obj 532 45 gemhead;
#X msg 107 177 lighting 1;
#X obj 532 156 rotate;
#X floatatom 580 137 4 0 0 0 - - -;
#X obj 313 354 gemhead 1;
#X msg 107 146 lighting 0;
#X obj 532 177 sphere;
#X text 150 38 create a sphere with and without lighting;
#X text 547 91 rotate the sphere;
#X text 313 314 gemhead has a value of 1 so that it is rendered before
the sphere is;
#X text 46 125 you can turn lighting on and off while it is running
;
#X msg 398 507 1 1 1;
#X msg 345 505 1 0 1;
#X text 449 501 change the lights color;
#X floatatom 389 355 0 0 0 0 - - -;
#X msg 185 424 debug 0;
#X msg 186 455 debug 1;
#X text 96 400 figure out where the light is;
#X obj 313 535 light;
#X text 240 558 creates a local light;
#X msg 434 436 2;
#X msg 477 436 3;
#X msg 390 438 1.1;
#X text 389 417 change the position of the light;
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#X obj 313 475 translateXYZ 2 0 0;
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#X msg 350 219 set \$1;
#X text 118 122 rendering;
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