Wouldn't "rosas" be the correct form of the adjective to go with "lámparas"?
Certain colours accept both the singular form and the plural form with plural nouns. If you have a look at the table in the lesson, those colours that reference a fruit (e.g. naranja) or a flower (e.g. rosa) admit both forms.
You can then say lámparas rosa or lámparas rosas.
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