Lights Ordered: What Config? 8 x 4 Foot Bulbs. Help?

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Guys, I have lights on the way, its 8 bulbs that are four feet each.

Lumens: 40,000 total
Lights: T5HO (6500k)
Wattage: 540 total watts

I am able to substitute some 3000k bulbs in place of some of the 6500k bulbs. Should I do this, and what ratio? This is for tomatoes, peppers, cukes, etc.

Essentially, I can either put in 6500k or 3000k bulbs, 8 positions. Want feedback before I confirm the order.