When the magnet is close (the book cover is closed) the light is off:
Move the magnet away (the cover is opened), the light comes on – hole lights up:
I’m just worried about the two led ‘eyes‘ that you end up seeing, the beam is strong but directed in one direction, upwards:To avoid that I’d need a substantial gap between the light and the paper which isn’t really an option, [it needs to look like a normal (ish) cover] or I use a thicker opaquer material to diffuse the rays more but then the overall light is dimmed. Are the ‘eyes’ a problem? A little distracting in my opinion.