Didn't strain my neck during installation because I positioned and stuck the panel to the dome light housing, while the housing was removed from my car, and was on my workbench, and I was looking down at it, instead of looking up at the housing, while it was in the car. A 2010 Toyota Matrix dome light. The housing comes out of the ceiling very easily, by squeezing 2 clips, diagonally opposite each other at the corners of the housing. If you center the 1.5 by 5 inch panel in the space that is available for it, one clip will be completely obscured. It would no longer be easy to remove the housing. You would have to first unstick the panel, before you could squeeze one of the clips. So I move the panel right up against the sliding switch. It looks fine once the lens is installed - more centered than if I had centered it. Now there is room to get a screw driver in to squeeze the clip that otherwize would have been completely obscured. I removed the double-sticky tape from the panel, where the panel partially obscures the clip, so that it doesn't interfere with squeezing the clip. I had to do several trial fittings to get everything just right. While doing this, one of the lead-in wires broke, right at the circuit board. I resoldered it. See the forum. I think the wires could have been attached more securely - by using some kind of potting material over the solder joints, and the ends of the wires near the solder joints, in order to prevent the wires from breaking, with mild to moderate tension on them, or with (not so) frequent bending of them. I'm taking a star off for the wires not being secured strongly enough.
The lamp is much brighter than the 5 to 8 watt incandescent, 27 mm festoon lamp, that it replaced. And uses only 3.5 watts acc to Oznium's Customer Questions page. However it isn't as bright as I would have hoped. I was hoping it would light up my car like the fluorescent lamp in my kitchen, lights up my kitchen. But it doesn't. Part of the problem is that the interior of my car is mostly charcoal black (dark gray, nearly black) - seats, carpets, door panels. If I add a second dome light, the rear one, and 2 LED map lights, maybe that will help. But that would come to about $110 total (not including shipping) for 4 panels. 4 incandescents would have cost about $6 or 7! I suppose I could save some money if I buy LEDs, circuit boards, and resisters, and wire my own LED panels.