Create your composition, add solid, apply particular.
Emitter
Particles/sec = 10
Emitter type = box.
Emitter position XY = middle of comp, bottom of comp(ie in a 872,486 comp = 436,486)
Direction = directional
X Rotation = +90
Emitter size x = width of comp
Emitter size y = 50
Emitter size z = 10
Particle
Particle type – Glow Sphere
Size = 50
Size random = 50
Color random = 86%(there a bunch of different ways to get random color, sample from a gradient, precompose a layer that samples the color….)
opacity random = 25%
Transfer mode = add.
These settings will give you a pretty good start, experiment from there, particle life, opacity over life…
Good luck
Johnny Cuevas, Editor
http://www.thinkck.com