Is this LEGO set still popular among Ninjago collectors?

Yes, this 2015 Ninjago theme set is popular with collectors of the Ninjago franchise.

What is the set number for the Kai night light and decals?

The set number for the LEGO Ninjago Kai Brick Night Light and Wall Decals is LGLNI4K-1.

No, this specific set, LGLNI4K-1, is listed as having 0 pieces.

Name: LEGO Ninjago Brick Night Light and Wall Decals - Kai (LGLNI4K-1)
Brand: LEGO

Houseware

Houseware · 2015

Theme · HousewarePieces · 0Set Number · LGLNI4K-1Year · 2015

Used

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New / Sealed

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Is this LEGO set still popular among Ninjago collectors?: Yes, this 2015 Ninjago theme set is popular with collectors of the Ninjago franchise.
What is the set number for the Kai night light and decals?: The set number for the LEGO Ninjago Kai Brick Night Light and Wall Decals is LGLNI4K-1.
Does this set contain any physical building bricks?: No, this specific set, LGLNI4K-1, is listed as having 0 pieces.