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prettydarn,
IMHO since flower is the most impoprtant phase of growth, the soft white or 2700-3700k lights would be the best if you can only go with one type. Your seedlings might stretch a bit but, your prized buds will at least be exposed to the most favorable spectrum.
needabuz,
the only way you know 99% you have female seeds is to buy feminized seeds. Otherwise it is really luck of the draw. Stress may or may not lead to more males; no one really knows for sure. Just figure about 50/50 chance male/female.
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