Top critical review
USELESS - light blocked by internal mask,
May 16, 2018
The "special built in filter" mentioned in the description blocks so much light that this thing is USELESS - a black mask, inside the plastic that allows light to come through only tiny holes. See the included photograph of a portion of one corner, taken at the "brightest" setting.
I really wanted to like this thing, contacted the Manufacturer and got a nice "Thank you for your interest" - but no answer to my question,
I'm posting this here as a warning, and also to find out if someone has a suggestion how it might be made to work.