Building an Ikea Platsa enclosure I was looking for a strong even light for the enclosure. 

I chose the PULUZ 20cm LED Photography Photo Video Light Panel Shadowless Softbox Bottom Light panel which I purchased from Amazon - https://smile.amazon.co.uk/gp/product/B07FVN1CYZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I designed these simple brackets to hold them in place. They should fit other light panels and can be easily scaled for a perfect fit.

I printed them in PETG using 3 perimeters and 30% infill. Choose your own parameter depending on the application