Bulb comparisons - these results were reproduced from the stunning works at www.cnidarianreef.com

After receiving my free Radium 20,000 Kelvins bulb yesterday, I was thinking - why not use Radiums? Currently using Iwasaki 20,000K and was thinking of a switch to XM 20,000K.

Looking at the chart, using a PFO standard ballast, Radium gives slightly better output (measured in terms of PAR - Photosynthetically-Available Radiation). Nice! Now to see the colours, hopefully there'll be a nice display of bulbs at Aquarama '05 this weekend, so I can take my pick.

PFO Standard
Lamp	PAR	Watts	MaxWatts	Amps	MaxAmp
Iwasaki	691	286	331	2.53	6.86
XM10K	600	268	269	2.47	3.39
AB13K	566	301	303	2.64	3.81
BLSW	514	273	274	2.49	5.47
EVC10K	512	271	278	2.5	3.12
SUN10K	510	270	277	2.51	2.69
Ushio	485	284	285	2.53	4.57
CV10K	324	231	233	2.32	4.03
SBURST12K	309	269	269	2.51	6.01
Radium	283	231	232	2.38	6.81
CV20K	275	226	261	2.3	7.93
PFO 13K	248	257	258	2.5	6.8
XM20K	242	285	285	2.57	3.75
CV15K	242	227	239	2.35	4.14
AC14K	228	212	274	2.33	8.29
SUN14K	228	224	228	2.32	4.08
HM14K	214	219	220	2.3	7.12
CV12K	190	230	230	2.38	3.54
SUN20K	148	198	199	2.25	6.11