Make a new file that would have 1181x837px and 300 dpi. Paint it with the next color –
C00000 
Then take the instrument

and represent several triangles of the same color –
900000.

Take the previous instrument to represent several more triangles of the same color also –
700000. Place everything out the way it is shown in the picture.

Using the same tool

, picture a lightning’s silhouette with the indicated sizes below.
Blending Options-Gradient Overlay
Gradient’s parameters 
Take the same instrument and picture one more lightning’s silhouette with the demonstrated parameters in the next picture.
Blending Options-Gradient Overlay
Gradient’s parameters.

Using the already known instrument, represent another lightning silhouette with the sizes below.
Blending Options-Gradient Overlay
Gradient’s parameters.