I would go with the 600's, if you get the Philips SON-T bulb you will get 92,000 lumens per bulb. 600's do have the most lumens per watt and do run a lot cooler then 1000w but you are going to pay a lot more for two 600's. with a 6X4 room that gives you 24 sqft, with a 1000W thats 41 watts per sqft. with two 600's its 50 watts per sqft. you want 45 to 65 watts per sqft to get the best results.


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