Quote:
Originally posted by Doug:
Interesting Steve, but thats at 9 inchs. Halides are supposed to penetrate deeper than vho or pc bulbs, thus the reasoning for their use on deeper tanks.
In a shallow tank, one could grow sps with normal outputs bulbs. Can you do a measure, say at 18 inch and one at 24 inch? That would be interesting.
Also a bulb cost versus intensity versus watts, would be interesting also. Halide fixtures to drive 175 watt halides can be pretty cheap now days and the bulbs can be purchased for a $100 on sale. I have never purchased pc bulbs or fixtures, so cant comment on them.
175 watt German 10K bulbs are one of the best on the market. They dont necc. need any supplement actinics. I was going to run mine the suggested 18 months before changing out. It would also be good to see the par ratings at different depths, compared with pc,s after a years use. Do pc bulbs still have good colour and par after a year?
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<font size="2" face="Verdana, Helvetica, sans-serif">Doug, I plan on doing a test every month to compare. the reason I did 9" this time is that I only have one mounting stick for the PAR sensor and with the angle it is bent, it was a distance of 9" to keep it strait up and down. I am going to make a couple more sticks so I can do different depths and get more under the MH bulb. the problem will be as I only have one MH bulb and it is directly over my rock pile so I don't know if I can go much deeper unless I buy another bulb... even with another bulb the most I could do is 19 to 20" as I have a 24" deep tank and a 6" sand bed but i will see what I can come up with.
the cheepest you can do a 175 watt Ushio MH is 129.00 for the bulb and if I go buy the ballast my self... 69.00 and then a few bucks for wiring.. for a PC set up I can get TWO 96 wattt bulbs for 129.00 and a WH7 ballast for 58.00 plus a bit for the wiring.
Steve