What is this brush tool?

Question

This might be very stupid, because it is, but one day I was trying the different brush tools in elements 9 and I drew this white light with blue coming off the edges. As if it were a light. This was a default tool (I chose the colours of course, ignore the black background) However now i've tried to find it but can't draw this anymore, it was a default tool and setting so I'd like to be able to create this sort of thing in just one click again, can anyone tell me what brush type (along with any settings for the brushes) would be used to make this. Thank you for your help!

Answer 1

Then follow the steps that Terri_F posted (starting with a black background):
Start with a soft-edged brush of fairly large size:  550px or more.
Set the Mode to "Screen".
Choose a foreground colour which will become the diffuse glow -- a blue, in this case.
Left-click once to establish the outer extent of the diffuse glow.
Without moving the brush, hit the "[" key a few times to reduce the size of the brush and left-click.
Repeat step 5.
Ken