"Marc Levenson" wrote in message ...
It's all in the wording. And in the eyes of the reader.

I am affraid I can do a little about that then...

But we are not talking about VHO, right?

Right. But we are using a VHO ballast.

So what? :-) Is the balast the reason we replace VHO every 6 months?

We are talking about overdriven NO tubes.
Who has measured here the spectrum changing over time
given by the overdriven NO tubes?

I don't know. The guy that pointed me to this idea has contacts with many vendors, and has been
in the marine industry for a long time. I figured he might have been told by someone that
actually did the tests. I wonder if Sanjay Yoshi might have done it yet? If so, he'd have your
answer. If I see him at Macna next month, I'll ask him and post his response.

Thank you. It would be much more reliable information than "it looks good for me" :-)

You argue too good. Gonna be a lawyer one day? Or simply the Devil's Advocate?

I am The Devil myself :-)

OK - the question is: is it still really 6500K when overdriven?
How is the spectrum change with overdriving the tube?
Do you know that and can asure us that nothing changes except the intensity?

Maybe Sanjay will know.

People in this thread indicated the tubes change slightly in color.
And this was visible change. There are probably more hard to notice changes.
Lets wait for his answer.

Was it to contradict opinion about wrong spectrum promoting algae grow?
Or maybe to contradict opinion that overdriven tubes change the spectrum?

Statement #1.

Interesting... and I can read about this in so many places...
Probably in the same places I read about replacing VHO every 6 months :-)))

So why do you replace VHO bulbs religiously every 6 months
if you do not care too much about the right light spectrum?
You said you do not see the difference in light, but you still change them. Why?

See? This is the reason I react questioning reasoning here :-))) Do not blame me.

I can't say yet. Cost of bulbs, cost of consumed electricity, cost of replacement ballasts....

PCs seem like the best bet economically to me.