how to draw a single pixel in pyglet

1# this works but it takes FOREVER
2# 50 by 50 square going from black to white
3for i in range(50):
4    for j in range(50):
5        color = int(2.56 * (i + j))
6        pyglet.graphics.draw(1, pyglet.gl.GL_POINTS,
7            ('v2i', (i, j)),
8            ('c3B', (color, color, color))
9        )
10