So we dig for gold, transport it around the world and somehow get the stuff into the leaves of trees AND THEN shine a bloody UV light on them, to make them glow to replace lamposts? What about the solar technology as used in garden light posts which practically everybody now seems to have. So far the only downside I've had is the batteries need replacing every couple of years.

Well I guess if there's even the slightest manufacturing fault with the batteries the high current drain could result in fire. Your browsing session is pretty much over then.