color change on export to PDF

When I create graphics in NodeBox all is OK with the colors.
When I export to TIFF all is OK with the colors.
When I export to PDF the colors are much lighter.
Does anyone else experience this?

I used DigitalColor Meter on the same screen and my own eyes.

Color1 = color(.902, .365, .973)
Color2 = color(0, 1, .133)
 
size(200, 100)
 
fill(Color1)
rect(0, 0, 100, 100)
 
fill(Color2)
rect(100, 0, 100, 100)

With outputmode(CMYK) there is no such problem.