I've been running T5's on 660 for a good 8+ years. I've never had a single bulb burst or get holes in them. The bulbs will only last 6 months,(keeping spectrum) but that is about the same life as ATI ballasts on a DIY fixture with no fans.
But with normally driven lamps, the lamps should last about a year give or take, with active cooling, while maintaining full output and spectrum. That means that you are replacing lamps twice as often as it should be necessary. That is not a good advertisement or recommendation for using a T12/VHO ballast to run T5/HO lamps is it.
The problem with the 660 and 430 running T5/HO lamps was sufficient enough in scope to force IceCap to take action to mitigate the problems.
My fixtures are open air with no fans. Running this way the ballasts stay cool and last for years. My first ballast was good 7 years old. If these ballasts are enclosed in a canopy they will over heat or if they are combined with halides they won't last as long.
The problem is not with the ballast. The IceCap ballasts were always quality ballasts, with a rediculous price tag albeit...
The demise of these ballasts is greatly exaggerated as they have been re-introduced under Coralvue's name just within the last month or so because there is a demand.
The ballasts did not suffer a 'demise,' the company making them went under, and there is no exaggeration about it. The company went under because they refused to update their technology, and they were re-branding low-quality equipment, selling it at a premium price. CoralVue is trying to piggyback off the IceCap name, and are pushing the marketing hype.
Being in demand, has no relevance on whether or not the ballasts should be used to run T5/HO, whether or not it is safe to do so, nor whether or not folks will have problems in T5/HO setups. There is a demand for miracle mud, but that does not make it any less of a hoax. This only demonstrates that the aquarium hobby is driven by marketing hype.
The ballasts never went away as Coralvue just took over. They newer version is improved to fix any issues the old 660 may have had.
The ballasts did not have any issues, but they did go away as production was suspended, when IceCap went under. The situation was they were T12/VHO ballasts improperly used to run T5/HO lamps. The ballasts currently being marketed by CoralVue, still T12/VHO ballasts, are not appropriate for running T5/HO lamps.
You have always been able to get a 660 fixed for $60 through Coralvue.
Well, someone had to service them...
I get about 25% more par and of course the bulbs are brighter.
This is where it gets confusing. Since the spikes in the photosynthetic curve (blue/red) do not match the spikes in what is considered "bright" light as preceived by the human eye (green/yellow) high par lamps will be "dimmer" as preceived by the human eye. What your observation shows is the par increase by "overdriving" the lamps, is in the Green/Yellow portion of the light spectrum e.g. middle of the spectrum not in the blue (high energey) and red (low energey) portions of the spectrum, where the photosynthetic response would be the greatest.
Having said all that you'll probably be better of with the ballasts used for the ATI's. I'm not sure of the brand but the ballast says HEP group on it. It's definitely the best matched ballast with their bulbs for color rendition versus the other "matched" ballasts.
Not necessarily. Although an arqument can be made that since T5/HO is a European technology, European ballasts may be closer to the specifications of the T5/HO technology, as was the case with many Metal Halide lamps, for which there was never an ANSI standard, and matching the MH lamps, with ANSI standard ballasts was a bit of a problem. The ATI Powermodule (prior to addition of LEDs) was the top of the pile fixutre, but there was more to it than the ballasts: Very high quality reflectors, very high quality lamps, and very efficient active cooling. That said, you can hardly go wrong using ballasts provided by ATI. However, if the rest is not up to "par" it is not going to make any difference.
**********************************************************
IceCap was marketing single lamp reflectors, and these reflectors were excellent. Topped only by those that Aquactinics are marketing, and the "difference" being in the width (Aquactinics being narrower.)
As far as the 660 and the obsession with overdriving T5 goes, the most stunning displays I have seen (outside large public aquariums and the natural reef) have been under normally driven T5/HO lighting. Metal Halide running neck and neck, but LED does not even fall into the "also ran" category yet... having said that, I have seen displays running with T8/T12VHO that put everything else to shame. (See GARF.) The conclusion can be made, that is is not all about the lighting, and the obsession with overdriving, is just that: an obsession, and there is a lot more to this than the lighting.