Shortening Chines LED string

I have purchased a rocket led string( warm white size 5mm) which has near bout 100 led lights, for my project I want to create string of 10 LED. I have also purchased a controller which produces 36VDC with 350 MA max, this lights up 10 led but they are not that much bright. Whats going wrong? do I need to purchase controller which produces 1 Amp or 2 Amp ?

Note: I have tried with 9 leds but result is same.

Thanks,