OpenGL ES flash of bright light

I'm having some trouble achieving my desired effect in an OpenGL ES app I'm working on. I can use OpenGL ES 1.1 or 2.0. What I'm trying to achieve is the following...

In a 2D ortho scene (black clear color), render a red square to the screen with some transparency so it is a darker red (or just set to darker red color). This is no problem for me. Then, when a user clicks in the region of the square, I want it to quickly flash in a bright flash of light (just in the region of the square). This flash doesn't have to persist long at all, just enough that if the user was in a completely dark room, this flash of light would create a brief noticeable flash in the users face. I've been having some trouble getting a "light bloom" or glow effect to work efficiently, and was wondering if anyone had ideas for a quick, efficient way to make the color flash brightly for a split second. Possibly through the use of some kind of texturing trick that I don't know of. Also, the flash doesn't have to blur outside of the开发者_运维技巧 region, it can be fully contained within the region with sharp edges. Really all I'm after is the aesthetic of the flash lighting the immediate area around the screen.

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Disable texturing, glColor3ub(255,255,255), render square, wait a bit, redraw square normally.