Ok regarding Kelvin its like this....

You got three primary colors.

Red is 660 Nanometers
Yellow is 540 Nanometers and
Blue is 420 Nanometers

You can have 68% yellow, 22% blue and 10% red light and get and average of 526 which is green.

526 would be expressed as 5703 Kelvin.

Now you can get 5703 Kelvin with other percentages of red, yellow and green. Say you have 68% red light. The other percentages would just adjust and you would get still 5703 which is why I say it means little. It is an average of nanometers that could really be any color. It is a broad way to define a frequency really. The CRI or color rating index is better to use when defining grow bulbs how ever is tough to do in your head at the grow shop.



This is basically what the sun is and why plants are green......

.6823529411764705882352941176471 x 540 = 368.47058823529411764705882352938
.21674740484429065743944636678203 x 420 = 91.03391003460207612456747404844
.1008996539792387543252595155709 x 660 = 66.5937716262975778546712802762
526.09826989619377162629757785394 is total. 525 nanometers is green
OrganicChemist Reviewed by OrganicChemist on . The coolest thing I ever saw. So I am under the belief this is the coolest thing I ever saw though my girl says I am dumb. She is not a grower though so I need to know what the growers say. Am I an idiot or is this not the coolest thing ever. I got it from www.gorillagrow.org:rastasmoke: Rating: 5