Home |
Search |
Today's Posts |
#13
|
|||
|
|||
OT free lighting
On 14/08/2013 17:59, Chris Hogg wrote:
A calculation: sunlight's composition at ground level, per square meter, with the sun at the zenith, is about 527 watts of infrared radiation, 445 watts of visible light, and 32 watts of ultraviolet radiation (from http://en.wikipedia.org/wiki/Sunlight). Call it 450 w/m^2 of visible light, or 0.045 w/cm^2, or 22.2 cm^2/w. If a bottle delivers say 50 watts of light, then each bottle will have to have a cross-sectional area of 50/0.045 = 1110 cm^2, or a diameter of about 37.6 cm. So they'd have to be even bigger than Jeff suggested, which makes me think the estimate of 40-60 watts is somewhat exaggerated. Yes, I was mistakenly basing my calculation on the approx 1000w/m^2 of total solar energy delivered perpendicularly. I hadn't taken into account that only around half is visible. I had also assumed that when the term "water bottle" was used in the article, it was referring to those large bottles found on water coolers. -- Jeff |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Free Website, Free Domain, Free Installation, Free Scripts | United Kingdom | |||
Raleigh, NC - FREE Fresh Fescue Sod...FREE!!! | Lawns | |||
Free satellite imagery + free utility available for making beautiful base maps | Plant Science | |||
Free lighting stuff. (shipping) | Freshwater Aquaria Plants | |||
Lighting Question -length and interrupted lighting | Freshwater Aquaria Plants |