You need highly transparent, white filament and bright bulbs like the BEST and ONLY filament formulated for lithophanes from https://americanfilament.us/ to ensure that you still light up the room well.

Recommended Filament: https://amzn.to/2NlAqYk
Recommended bright bulbs: https://amzn.to/2XnXAll

Check out all of my lithophane tools at https://LithophaneMaker.com

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