3-4 feet from the plants should be fine as long as it's not to hot for the plants. A 600 watt bulb puts out more heat than a standard 400 watt bulb. You want the air temp at the plants foliage to be between 80 and 90 (preferably 80-85). Well at least for most varieties of strawberry's. There are cool weather (northern) varieties that don't tolerate heat well and would prefer temps closer to 75-80, and varieties that do tolerate heat that will do fine up to 100 degrees. It depends on what varieties you have.
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