An easier way, the way I did it:

Set gravity radial (w)

flood fill screen with thunder (ctrl+shift click)

Upause, let gravity pull the thunder towards the center

After it all reachs the middle, type into the console:

!set type thdr n (n being the desired element)

!reset temp

*(If it's a clne, type !set ctype n)

TADA!!!!

Compressing LIGH Element

Method 1

>put a pixel of ligh on the screen (use a big pen size)

>press f ONCE and wait for it to expand into its full size (wait for the bolts)

>copy paste the bolts onto the screen

>open console (key ~)

>!set x all 100

>!set y all 100

>unpause for profit

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Method 2

>flood fill screen (ctrl/shift/click)

>open console

>!set type all ligh

>!set tmp ligh 257

>!set life ligh 55

>!set x all 100

>!set y all 100

Actually this method of making compressed elements is much better. I made a save explaining it:

After you create the compressed clone, you can change it into any element.