12000k xenon car lights

[sphelps]

Originally Posted by Whatigot

sounds like someone stating facts and not asking questions.
Look at all of those unsubstantiated numbers you threw up there to try and make your point...lol

Give it up, eat your cake or have it, don't try and do both.

I still don't get it. Those look like question marks to me and all those "maybes" seem to suggest examples not factual numbers. Are you arguing just for the the sake of arguing or what? And for the second time what numbers do you feel would be more accurate??

And if I buy the whole cake I can eat half and keep the rest.

[Pescador]

I'm trying to digest that article on Xenon bulbs.
The ones they tested were long-arc bulbs which according to Wikipedia are "frequently used to simulate sunlight". The bulbs they used were 4500w and 10,000w.

Headlights are short-arc and more from Wikipedia

Xenon short-arc lamps are low-voltage, high-current, DC devices with a negative temperature coefficient. They require a high voltage pulse in the 50 kV range to start the lamp, and require extremely well regulated dc as the power source. They are also inherently unstable, prone to phenomena such as plasma oscillation and thermal runaway. Because of these characteristics, xenon short-arc lamps require a sophisticated power supply to achieve stable, long-life operation.

[sphelps]

From the article posted by The New Guy

Originally Posted by article

Intro

While most discharge lamps e.g. mercury, sodium, or metal halide lamps emit a more or less pronounced line spectrum, the radiation output of xenon is dominated by a smooth continuum

the continuum is centered around the green spectral range (550 nm)

The present development mainly favours other lamp types, like metal halide lamps and fluorescent lamps for commercial lighting purposes


Results

The radiation penetrating the quartz envelope of a xenon lamp shows an almost flat part with little line structure in the visible range and a pronounced line structure in the IR spectrum
The heat resulting from excess IR absorption by biological tissues will lead to rapid destruction. Excess short-wave UV radiation will also be deleterious to living systems.
Xenon lighting, therefore, requires specially tailored filters which, protect living systems from these spectral irradiances.

xenon lamps should be ideally driven by direct current. This mode, however, results in a reduced lifetime as compared to AC driven xenon lamps.

Metal halide lamps have with regard to the luminous efficiency an advantage of a factor 4 as compared to long arc xenon lamps. This also holds approximately for the PAR region. The main reason is the strong excess IR of xenon radiation.
However, it must be considered that metal halide lighting requires several additional measures, These additional measures reduce the advantage to a factor 2 to 3.

As the IR output of metal halide lamps is much lower, an effective heat control can be achieved by economic glass or water filters. Xenon lamps require more sophisticated and expensive systems of optical filters and cooling techniques to remove the strong excess IR energy.

Despite the relatively low lighting efficiency xenon arcs reach highest artificial luminance concentrated to a single lamp and compare in this respect best with sunlight. Therefore, xenon lamps are unique, for instance, as a light source of projectors and monochromator systems. Furthermore, xenon lamps do practically not need a warming-up time but the full illuminance is available immediately.

The advantage of metal halide lamps is their economical adaptability to biological applications, while xenon lamps provide an almost constant smooth spectral output close to sunlight over a wide range of power.


Conclusion

Therefore , despite considerable competition by other lighting techniques, xenon lamps provide a very useful tool for special purposes. In plant lighting however, they seem to play a less important role as other lamp and lighting developments can meet these particular requirements at lower costs.

[dabandit]

How does a 70w mh cost less than a 35w xenon I wonder? Anyway Im not talking about replacing a product morso filling a gap where no product exist. As for the greenish nm ratings disscused thats not for the 10000k xenon.
Come out with a mh bulb less than70w at 10000k I'll agree mh is better but at the moment there is nothing for a nano reefer to keep sps under 7ow just complicated and also unproven l.e.d system which is insanelly expensive. Seems to me that article said it was possible with a filter also the final par value of mh to xenon was pretty close did it not? Just speculation on your part now anyway lets see some numbers...and links...and a blood sample lol

[sphelps]

Originally Posted by dabandit

How does a 70w mh cost less than a 35w xenon I wonder?

Ballast
Bulb
A halogen spotlight fixture works great as a DIY pendant, bulb fits into the same sockets.
No power source needed, all in all cheaper than a 35W DC Xenon (just bulb and ballast).

Originally Posted by dabandit

Anyway Im not talking about replacing a product morso filling a gap where no product exist. As for the greenish nm ratings disscused thats not for the 10000k xenon.

So out of curiosity how do they make 10K Xenon? Is it a filter they place on the bulb to filter the spectrum to 10K? Otherwise they would have to add different noble gasses to illuminate a higher spectrum. Any ideas?

Originally Posted by dabandit

Come out with a mh bulb less than70w at 10000k I'll agree mh is better but at the moment there is nothing for a nano reefer to keep sps under 7ow just complicated and also unproven l.e.d system which is insanelly expensive.

I still think a 20K 70W halide would work great on a nano, even a 5.5gal, you could always hang it a little higher and run a small fan for heat if needed. But that's just me I guess. Does anyone have a link to an SPS 5.5gal? Sounds difficult, the lighting would be the easy part.

Originally Posted by dabandit

Seems to me that article said it was possible with a filter also the final par value of mh to xenon was pretty close did it not?

You have to show me that cause I didn't get that from it.

Originally Posted by Article

Metal halide lamps have with regard to the luminous efficiency an advantage of a factor 4 as compared to long arc xenon lamps (Table 2). This also holds approximately for the PAR region.

Originally Posted by dabandit

Just speculation on your part now anyway lets see some numbers...and links...and a blood sample lol

I'm not sure how got speculation. All did was quote some of what I though were the key parts of the article. And I gave a link to it and it was originally posted by The New Guy (BTW Thanks TNG) and why would you want a blood sample?

Actually my biggest concern from that article is the IR radiation, what filter would you use to deal with that?

[dabandit]

1. I assume they get the different k ratings the exact same way as they would with mh being as its the same technology but thats a guess
2.What to use as a filter im not sure,time will tell if one is even needed
3.It was a joke im trying to take the negativity out of this
4.The article said the mh needed extra measures which reduced its advantage to two also it said close to par value,sounds like the par would be close to me or am I reading this wrong?.I did claim the test I saw was close did I not?
5. What are you talking about with the halogen,running a mh bulb? efficientlly?

[dabandit]

sry didnt catch the links about the halogen,I mean how is it more efficient to run a 70w over a 35w?

[sphelps]

Originally Posted by dabandit

how is it more efficient to run a 70w over a 35w?

Not sure I follow, is that something I said or someone else?

Efficiency can be interpolated many different ways but in the hobby I believe we tend to use PAR compared to actual measured power used. So a 10K would be more efficient than a 20K of the same wattage. So a 70W MH could be more efficient than a 35W Xenon or different lighting source, but it all depends on the PAR rating for Xenon and of course bulbs and ballasts used.

[dabandit]

Superduper,I dont follow ,those two comments you highlighted are unrelated. I think were all on the same side? didnt realise there were sides,just a group of people trying to find answers,though some perhaps myself included could be a little more polite about how they go about doing it.

[superduperwesman]

Originally Posted by dabandit

Superduper,I dont follow ,those two comments you highlighted are unrelated. I think were all on the same side? didnt realise there were sides,just a group of people trying to find answers,though some perhaps myself included could be a little more polite about how they go about doing it.

No worries... I just find other things interesting while people are trying to find those answers