This light holder is designed for this worklight, link below:
https://www.canadiantire.ca/en/pdp/cob-3000k-puck-light-warm-white-0373155p.0373155.html?rrecName=Similar%20Items%20&rrecReferrer=product&rrecProductId=0373155P&rrecProductSlot=3&rrecSchemeId=product1_rr&rrec=true
It is also designed for paintings with the width of 1.5 centimeters.