steve, most varieties have green root tips, regardless of light levels. the varieties which have other colors of root tips will only produce that color if the root tips are getting enough light. if the roots are buried in the medium, the tips will usually be green. I've never measured the light levels in my growing area, so I really can't comment on specific light requirements. I only know how to recognize when they're getting too little or too much light.
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-Kip
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