I have SAD, and the special lamps that you get for that really can help a lot. It helps me get through the winter.
My lamp has 2 high output bulbs in it that put out somewhere around 10,000 lux. The thing is really bright!
You can get the 5000 Kelvin LED bulbs with pretty good lumen output, you just need enough of them to put out about 5000 lux or so.
I haven't looked to see if there are 6500 Kelvin color temp bulbs in LED, but I know they have flourescent bulbs with that color temp.
I have a 400 watt metal halide bulb and fixture that puts out a ton of light, but it takes a bit of power to run it. It's basically the kind of bulb that the pot farmers use for the veg stage in growing. Very white light, very bright.
Well I have ordered myself a lamp with 10000 lux and I assume it will be really really bright. I'm glad you're getting help from the light, I hope it will brighten my days too!
I have few 30 watt LED lamps which I'm using for my indoor plants (not pot of course ;) ) but my wife isn't happy how they look if I'll scatter them around the kitchen. They would do the trick though.