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#11
03-16-2006, 07:23 AM
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HQI - Mercury (Hg) Quartz Iodide
HQI I believe come in both SE & DE. Somebody asked me tonight so I googled it. 
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#12
03-16-2006, 01:40 PM
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Quote:
 Ok Like Delphinus and other have said, the term HQI is abused and not used properly at all in our industry. The HQI ballast is built to replicate German reactor type ballast outputs and comes in several different wattages, 50W , 70W, 150W, and 250W. (If they are making a 400W now I have never seen it) but I believe they use the Son Agro ballast for the 400 watt HQI (DE) but I am not sure. now a 250W HQI ballast will drive any 250W bulb on the market but a DE bulb has to be driven by a HQI ballast. make sense? so there is a difference in the bulbs a DE needs a DE holder, they are smaller profile and will put out close to the same light as most 400W set ups, but a 250 watt (quality bulb) SE run on a HQI ballast will put out more light than than most 400W systems and with reflectors thrown in the results can be amazing. the DE bulb is great for tight spots, smaller tanks (less of a foot print to run say 2" x 2" at a max) where the SE will light a 3ft x 3ft spot with about the same amount of light intensity. Also there are a lot more choices in lights on the SE side but DE is getting better. Steve
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#13
03-16-2006, 05:46 PM
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So a 250HQI would put out more light that a 400W SE of equivilent spectrum?
So if I upgrade my 150HQI aqualight to a 250HQI aqualight, is it like running 400W SE light system but only drawing 250watts of power? I always thought it was just a typical "sales pitch" when they say a 150HQI performes to a standard 250W MH.
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#14
03-16-2006, 05:49 PM
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I can't believe a 250 DE would put out the par of a 400w SE, I am going to look for some studies.
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#15
03-16-2006, 06:27 PM
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RE: Studies...
I found this interesting. http://www.reeflightinginfo.arvixe.com/select2lamp.php In the case of 250W bulbs, I noticed that the SE bulb produced more par than the DE bulb given ALL ELSE EQUAL. In other words, when you: pick the same wattage for both sides (250W) and pick the same ballast for both sides, and pick the same K rating on both sides, and then pick SE on one side and DE on the other side, you'll see that the SE bulb produced more par. This was the case for 14 random configurations that I checked out last year using the above link. (NOTE, don't forget to pick 'N' for the shielded drop down box for the SE bulb) Here's another interesting research article. http://www.advancedaquarist.com/issu...04/reviewb.htm "Comparing the data here and other 250W DE articles with the data for 250W Mogul lamps, should provide enough factual information to dispel the myth that 250W DE lamps produce more light output than the 250W single ended mogul lamps. A general sweeping statement to this effect cannot be made, and depends on the lamp under consideration." I haven't looked at 250W DE vs 400W SE comparisons but I'm sure someone else can. Last edited by Samw; 03-16-2006 at 06:37 PM.
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