On Tue, May 21, 2013 a spike <span dir="ltr"><<a href="mailto:spike@rainier66.com" target="_blank">spike@rainier66.com</a>></span> wrote:<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US"><div><div><div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote"><p class="MsoNormal" style="margin-bottom:12.0pt">
<span style="color:#1f497d">>> </span>You're right! I got that .02 percent figure from a New Scientist article but, as you point out, if you think about it a little it's obvious that it can't be even close to being correct. Sorry. Street lights are out, maybe decorative mood lighting?<span style="color:#1f497d"> </span><span style="color:#1f497d"></span></p>
</blockquote><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> > Sure, but the idea isn’t totally busted. </span></p>
</div></div></div></div></blockquote><div>Hmm, now that I think about it maybe not. It occurs to me that a 18 watt streetlamp does not produce anywhere near 18 watts of light, at best a incandescent light bulb is only about 10% efficient in converting electrical energy to visible light and even a LED is only about 20%, but a protein like Luciferase is about 85% efficient in converting chemical energy into visible light. Also the human eye is much more sensitive to green photons than other colors, if a bio-luminescent tree restricted its light output to just the green it would look at least 5 times as bright as a red or blue or white tree with equal light energy output.<br>
<br> John K Clark<br></div></div>