This has been something I have wanted to see for some time, so give up a few pics here and list what the bulb "K" is and if it is SE DE, Elect. Magnetic or HQI ballast.
my old 58 with 20K XM bulb, 250 watt DE HQI ballast yeah Barney peed in it.
same 58 with 14K hamilton 250 watt DE HQI ballast
29 gallon tank with 14K Phoenix 250 watt DE ARO Elect. ballast
125 with 10K 150 watt XM's and a single 250 Watt Ushio 10K all on ARO elect. ballasts
FTS
my old 58 with 20K XM bulb, 250 watt DE HQI ballast yeah Barney peed in it.

same 58 with 14K hamilton 250 watt DE HQI ballast

29 gallon tank with 14K Phoenix 250 watt DE ARO Elect. ballast

125 with 10K 150 watt XM's and a single 250 Watt Ushio 10K all on ARO elect. ballasts

FTS
