Hello Marc

"Light measured at the source is radiance. Light measured at a distance from the source is irradiance.

We are primarily interested in photosynthetic photon flux (radiance) and photosynthetic photon flux density (PPFD, irradiance). Other useful units are watts (radiance) and watts per square foot (irradiance).

Lumens are not a useful unit of measure of radiance for our purposes because the lumen is biased to human visual perception. The corresponding units of irradiance (lux, foot-candles) are also not useful."


Sorry love but is that from an episode of "Star Trek" I'm sorry Marc but I read that and it cracked me up

Anyway Marc how are Amanda and Stumpy?

Do me a favour Marc, when you grow the next crop just relax, let nature do the hard work and just look forward to reaping the rewards
Marc just look at some of the beautiful pics you have shown me, all the flowers and the trees, all done by nature
I tell you if I lived close by I'd be in there, getting rid of half the lights, all the nutrients and telling you to go and have a beer and relax
Then I'd go to the feild with the horses in, bag up some muck and feed that to you're girls

Please don't think I'm telling you off Marc because I'm not............speak to you soon.......................love mand xxx