@Post #14
I use Injectorall sensitized boards. If that photo was one of mine, I would say it is under exposed or under developed. Although the photosensitive layer is quite thin, with reflected light, one can see ridges around the protected areas, which are not evident in your photo. Put a drop of ferric chloride on a clear area, wash it off, and check for any color change or sign of etching. Even simpler, let water run over the board and see if it is wetted. If the water beads up over the clear areas, then you still have resist present.
@Post #15
Invalid link.
@Post #16
Have you considered just getting the usual fluorescent bulbs? The type I use are labeled "BL." With just one 15W bulb about 4" (10cm) away, my exposure was 12 to 15 minutes. I used a reflector made of aluminum foil that just lay on the bulb. Almost any white fluorescent bulb will work. They also put out a lot less heat.
Is the glass you are using ordinary single-pane glass or is it coated in any way, say to be non-reflective?
John