adjustable Ballast/Light question

Any problems running my 1000-watt HPS at 400 watts? I have an adjustable ballast which allows me to adjust from 400 to 1000 watts. Currently I have it turned down to 400. Slowly turning it up. I wanted to slowly introduce more light going from Veg. at 400 watt - to Flower at 1000 watt. Its lit and working fine but have heard that running a 1000-watt bulb at 400-600 watt is not a good thing to do?

It reduces bulb life
When I was trying this I kept 400 and 600 watt cheap bulbs at the ready
Oh and always wear cotton gloves to change bulbs

When you give a bulb less power than it's rating the temperature of the arc will be less therefore changing the spectrum being emitted from the bulb. It's best to run at rated wattage
When I spoke with the rep from illuminar he said the same thing and that the dimming feature is literally a selling point and he would never recommend using it, and that he has no idea why is even a thing.

Herb & Suds said:

It reduces bulb life
When I was trying this I kept 400 and 600 watt cheap bulbs at the ready
Oh and always wear cotton gloves to change bulbs

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I go as far as wiping down the bulbs once installed with alcohol to remove any oils from my hands etc.

I used to run my MH bulbs at reduced power because they were cheap and I had lots of them. The Hortilux HPS though only ever got run at 1000w as they are expensive and by that point of the grow, I wanted the light operating at 100%.

yes the dimming feature is a gimmic, i would never use a dimming feature unless it was an led light

I bought 250/400/600/1000w for my dimmable ballasts, for the cost versus peace of mind its worth it to me.