OK - the most important step to getting the "spark" effect right is choosing the right brushes. In addition to the brushes available at BioRUST, there is a good selection here:
PS Brushes.net - Photoshop Brushes, Your Number one source for Photoshop Brushes
I used some of the Lady Victoire "Flare" brushes.
The process is then just a matter of building up the effect, as follows:
- Make a new layer for each brush stroke
- Set the layer's Blending Mode to Screen
- Vary the colour and the brush tip on each layer
- Use Filter > Blur > Gaussian Blur to soften the brush strokes if necessary
- Experiment with lowering each Flare layer's Opacity to help blend them together
Here is my take on the effect:
and here's how my Layers Palette looked:
As you can see, I used three different coloured "flares" (white, orange and yellow) and then added a simple round white "hot spot" to represent the point of the laser.
Hope this explains it adequately.