Re: indoor lighting?
I have used a 400 watt 6500K Iwasaki MH to grow plants/algae/coral. I've grown bananas under 6500K shop lights (NO) with good results. As long as the plants are close to the bulbs, there isn't a need for HO fixtures, IMO. I have also used VHO bulbs for banana seedlings. I didn't notice much difference between VHO and NO on growth rate. For the cost of a MH bulb, you could buy 3+ NO fixtures with bulbs (cheap Home Depot shop lights). You can buy 6500K bulbs at home depot for about $3 each. I'd hang the fixtures from chains so you can adjust the height as the plants grow. That's what I did when I grew bananas indoors.
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Adam 
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