What causes light flicker?

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I have the Lumen lab lighting kit, when I power it up, the light continues to flicker even after 30 mins. Why? is it a bad ballast or lamp? or is it just something that I did wrong?

Someone in this site mentioned that bad grounding might cause this kind of flicker, but the wires that I used to power the ballast are thicker than those comming out of the ballast, isn't that good enough?
Any ideas?
 
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