Current usa 250W lighting issues

[DEAD_BY_DAWN]

If there is anyone who can help me out with this one.
Having two friends with a current usa outer orbit fixture and have recently replaced there
there bulbs the new ones are quite dim a dull glow is the best way to describe it.
The bulbs are from two manufactures ones a hamilton 14k the other i'm not to sure,
Is there a issues with the ballasts from current usa ?.
The bulbs have been running for three months now so are well past the break in period,it seems like there not getting enough juice .
thanks
john