Led light build

So I decided to give led a try after many successful years of mh/hps and I have a few questions. So I am going to build 2 units, 1 for veg will be a 100watt power supply 2 cob light setup one royal blue and 1 cool white chip.

The second is a bit different it will have 25 10 watt warm white leds

So my question is am I better off with many small cobs or a couple large ones? This light will be used to fill the gap between my 2 600watt hps. And the other is to increase my footprint in veg next to my 400watt mh.


Any Thoughts or recomendations would be awesome.

Bump

I'm looking at a larger driver but can't post the link unroll tommarow.