Erik,

thank you for the explanation how to make colour setup. But my question was most about bright of LEDs, not about colours.

See, I take datasheet of a Kingbright product and read:
- DC Forward Current: 30mA
- Peak Forward Current: 160mA

Now I do refresh for 8 rows (duty cycle = 1/8) with peak current 150mA. The result bright is about:
150/30 * 1/8 ~= 63% of nominal one at 30mA.

Now I try calculate it for 24 rows you use:
150/30 * 1/24 ~= 21%. Is it not very dim?
It is why I asked about that do you use some kind of parallel refresh technique or what. But I know about copyright so sorry for the question.

Regards,
Oleg