Light sources had two points and screens (10)

I believe the answer is:

lampshades

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'screens' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?

'light sources had two points' is the wordplay.
'light sources' becomes 'lamps' (I've seen this in another clue).
'two points' becomes 'ES' (two compass points).
'lamps'+'had'+'es'='LAMPSHADES'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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