I assume you mean "that's not true." Anyway, I didn't say it's all the difficult to get a 1000w very close to plants, just saying it's difficult than with a 600w, due to more heat per watt and more light/heat coming out of a similar sized piece of glass making more drastic differences in light (hotspots). This doesn't mean you can't get a 1000w 6 inches from the plant; it just means while 6 inches is as close as you can get with a 1000w, under the same conditions you should be able to get within 3-4 inches with a 600w (though you might light bleach the plants, as at 3 inches from a 600w a plant is getting a lot more light than 6 inches from a 1000w). Anyways, I see no reason you'd want plants 6 inches from a 1000w bulb; that's like 15,000 lumens/sq ft. Plants can't utilize that much light, even with CO2 supplementation.