How to fix blending?

Newbie & Debugging Questions
#1

So I’ve got this shader:
http://pastebin.com/5iax5iX6

And I render it through a for loop like this:

for(Light light : lights)
[bind shader]
[enable blend: blend function (GL_SRC_ALPHA, GL_ONE)]
[shader uniforms based on light]
[render large quad the size of the display]

for(Entity e : entity)
[enable blend: blend function (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)]
[render entity]
[disable blend]

[bind shader]

I’ve tried other blending methods, and most of them don’t let more than one light… light it.

Image:

MP4 format: http://gyazo.com/ea3b8611e0d746a1f8783db22320a198