9
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Rules (taken from Nikoli):

  1. Place light bulbs (circles) according to the following rules.
  2. Light bulbs may be placed in any of the white squares, the number in the square shows how many light bulbs are next to it, vertically and horizontally.
  3. Each light bulb illuminates from bulb to black square or outer frame in its row and column.
  4. Every white square must be illuminated and a light bulb can not illuminate another light bulb.
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  • $\begingroup$ Does an empty black square mean that any number of light bulbs may be next to it? $\endgroup$ – Weather Vane Mar 22 '20 at 12:50
  • $\begingroup$ @WeatherVane that's correct, empty black square may adjacent to any number of light bulbs. $\endgroup$ – athin Mar 22 '20 at 12:57
5
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First fill in the obvious ones

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Continue as follows

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Continue

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Continue by identifying where bulbs can't be

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Continue

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And Finally

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1
  • $\begingroup$ Yep, this is correct, well done! :D $\endgroup$ – athin Mar 23 '20 at 1:30

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