Oh I definitely prefer the look of daylight, or the 5,000 to 6,500K bulbs. But the plants? They don't seem to care.
Walstad used a 14 watt "Bright White" bulb. I would guess it might have been in the 4-5,000K range. And she had it mounted vertically, like you do. Surprisingly, that makes a big difference, according to this guy with a par meter: http://www.plantedtank.net/forums/li...r-bulbs-2.html
. But, she had the light centered over two
bowls. I'd guess that your 10 watt light is just fine for the plants, even if it looks a bit yellow to our eyes.
Over time, if the plants seem to need more light, you can put a higher wattage bulb in it. If it seems like too much light, you can just raise the light a bit higher.
Getting plant cuttings from a local is a great way to start. They are more likely to have been grown submersed, and more likely to thrive in your tap water. You might be lucky enough to have a hobbyist aquarium club in your area, but joining one is probably the quickest route to MTS - Multiple Tank Syndrome. It's a fun disease, so go ahead.