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Old 12-14-2012, 01:39 PM   #1
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MH question

I currently have a 92 gallon corner reef tank with 2x175w 14000k MH on top. I was wondering if i decide to upgrade to possibly 2x250w or 1x400w, can I still use the part where the bulb screws into, or do I have to replace that as well? I am noticing that my tank looks dimmer at the bottom than it does at the top. The tank is around 32 - 36" deep, I think. Also, not sure if i am posting in the right forum. Please move to correct one if it is in the wrong spot. TIA.
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Old 12-14-2012, 08:33 PM   #2
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Anybody?
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Old 12-15-2012, 12:49 PM   #3
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Yes, you can use the same mogul base for 175w, 250w or 400w MH bulbs.
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Old 12-16-2012, 06:02 PM   #4
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Thanks for the help. My next question is I am in need of new lights. Should I get more MH lights, or should I go all out and get LED lights? wWhere do you recommend I get the lights, either kind?
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Old 12-16-2012, 09:10 PM   #5
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y not give LED a shot? The main reason is that the increase output of the light would increase the heat if your tank by a lot.
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Old 12-17-2012, 12:02 AM   #6
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Also a couple of bulb replacements on the mh's would pay for the led's
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Old 12-19-2012, 11:23 AM   #7
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Not sure how many watts, or whatever to get for the leds to get, compared to the mh lights. I currently have 350 watts on my tank and would like to have around 500, or the equivilant in the leds. Any suggestions?
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Old 12-19-2012, 03:38 PM   #8
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500W MH on a 92 gallon? That is a lot of light and might be a bit too much IMO.
for 92g for about 300w would be enough for a MH. As for LED, it is all about PAR/PUR of the LED. As long as you can get about range from 250 tp 500 PAR for the tank you are well set for SPS tank. If cost is not an issue, you are welcome to go with 3x AI SoL or 3x of my Pharos LED.
I can promise you that it will not be as bright as MH simply because MH's lumen should be higher if you are running a whiter bulb. However, they will match the PAR level. Anything over that 250 to 500 PAR is just overkill and you have to dim down the fixtures or you will bleach your corals.

If cost is not issue, 2 or 3 of 144W bridgelux fixtures will cost about $200 to $300 less. However, it would be less functions and cost more to operate in long run
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Old 12-19-2012, 08:03 PM   #9
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I can not keep any other color corals other than green and brown. I was told by several lfs people that I need more lights to keep blue and red stuff. That's why I was looking to get brighter lights. Currently I use 2x175 14k MH.
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Old 12-19-2012, 08:33 PM   #10
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that is the first time I ever heard of color of the coral determind the lighting requirement of the coral.

A bright red mushroom doesn't need more light than the green bubble LPS for example.
The coloration of your coral could change depend on the spectrum of the light you use.
If your light is more closer to 10000K, even if they start as bright green or blue or red etc, they will slowly turn Brown. If it is closer to 20000K, your coral will slowly turn gree/blue

You should have Violet and some red and green to supplement your coloration overall. or most people go with higher Kelvin to bring the blue color out of corals.
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