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I have a light with 6 2ft T5 bulbs. What kind of bulb combination would I want for vegging? 6 of the 6500k bulbs?

If someone were trying to flower plants in space that was 4ft wide x 2ft deep x 4.5 ft high, how many watts should be used? I'm concerned that 400 watt hps may put off too much heat, but maybe I'm wrong. Would a 250 watt work? or would that just be shitty?