Greetings,
I have a 6W RGB with DT40W with 2W 532, 2W 638 and 2W 450nm from goldenstar. The problem is of course the beam size of the red and blue, they are very thick and as you know ( i did not, when i bought it) the dt40w has small mirrors, for 3mm beams.
The output of the diodes, tested...