building a cob light to match 1000 hid or hps would cost boat loads of money, they work great, but the investment is steep, I dont ever plan on increasing the size of my grow cab so the 200 watts of cobs was the final solution for my set up, but if you have plans to go bigger, certainly the big bulbs would be the way to go,, but only if you can control thier heat also, the cool tubes really help, but i hear guys are having to run thier big fans at high speeds and it blows your stealth cover in that room, stealth then becomes keeping people away from the entire room altogether,, certainly things to consider as your thoughts wander in this direction