Last winter I had lots of problems with bad flats.I managed to buy one A2 size sheet of electro luminescent material.
(Here is the link: http://www.posterpoweruk.co.uk/page5.htm )
It works as a perfectly uniform light source and delivers perfect astronomical flats.
I used unexpencive, light weight, plastic frames to protect the light source.
(Not the one with real glas, it's too heavy for the purpose)
As seen in the image, I used two rubber bands with hooks to attach the panel.
In action
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