Dimmable LED

[maron6977]

I just purchased cheap led light (55x3w) w/sunrise, sunset & lunar cycle .
To my disappointment the moonlights don't work at 10% & 5% setting . They do work at all the other settings (100%,50%,25%). Now there is no manual dimmer or a setting on the LCD display to adjust , everything is preprogrammed .
My question: Is there anyway to check what is wrong ?
The company doesn't seem to stand behind their product or even let me know if it is broken or they haven't perfected their product yet !

Do LED's need so much power before they start to illuminate ???

Any info would be helpful or point me in the right direction .
Thanks