I like the LEDs bulbs that are cylindrical, with a dome top. I find that you can actually point a beam of light about five to six feet away. This creates a colored dot on the wall, ceiling, or wherever.
I definatly wish they would come out with a UV version.
And I can't wait for them to make chasing/blinking strings.
As far as the number of LEDs...
You can only light up enough LEDs that seem to number according to the voltage applied. Until they make LEDs even more energy efficient, you'll probably have to deal with the 70 lamp string.
They could easily double that count, by taking advantage of the AC cycle. Since it's alternating current. (This is why it looks like it "flickers" when you glance rapidly past the lamps. As the AC reverses current flow, the LEDs are actually "off".)
By reversing the lamps to take advantage of the reverse current, (and the diode that only allows the current to pass in one direction,) You could in fact, extend the number of lamps X2. Because half the string would be on during the positive cycle, then go out as the negative cycle begins, thus the "reverse" circuit of LEDs would illuminate.
From my heart and from my hand
Why don't people understand
My intentions . . . .