I've just sent the e-mail asking for a replacement unit. I tried the KA1 in a market yesterday and I didn't like the added weight. Also I LOVE the Forma's handle, it's just so comfortable. That just convinced me I need to get a working Forma instead of a new KA1.
I would like to ask everyone saying they have no light issue: could you take a picture of the device with 100% white light on in a dark room? Not because I don't believe you, it's just we haven't seen one totally functioning device yet.
This is mine, light issue on the left side:
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