I understand the 400 watt responds differently than the 250 watt when using MV balalsts. Most people from what I have been reading couldn't tell the difference between MH and MV.
I suspect the yellower light may be linked to the TYPE of Mh ballast that was used.
-=Bryan=-
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Reefmaster:
hmm, well that'll explain it. [img]images/smiles/icon_redface.gif[/img] ) we tried it on a MH cap/coil. hey for interest to others, where did you get the MV ballast?<hr></blockquote>