Hope this helps.
Level
Required amount of Light to reach
Level 21 - 20 Light
Level 22 - 32 Light
Level 23 - 43 Light
Level 24 - 54 Light
Level 25 - 65 Light
Level 26 - 76 Light
Level 27 - 87 Light
Level 28 - 98 Light
Level 29 - 109 Light
Level 30 - 120 Light
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31 - 132 light 32 - 144 light