Quick MH help

GrimReapr1 · 09-24-2003, 10:16 PM

I just purchased some used MH's with ballast and socket. It's 2 MH 6,500k lights, 175 WATT a peice. Now my canopy is a small one, bit fitting the MH lights i still have room and all i need is a cover. The lights are a little old and i want HQI 10,000 k. So here comes the question. I want to buy a cover, glass seems to be my only option, but since I am using HQI, does it have to be UV protected glass?

The lights will be about 1-2" away from the glass, i know it's very close but i will be running some good ventilation and i have a chiller for the water. Any input on the cover would be very helpful.

Tank:
55 gallon Reef (48 x 13 x 21)
2 175 WATT, 6,500k MH
2 96 WATT PC
Auto top off

**Ninong** · 09-25-2003, 02:23 PM

Hi GrimReapr1, welcome to Reefland!

Regular tempered glass will work fine as a UV absorbing shield. My Aquastarlight fixture uses 3/16" tempered glass. Tempered glass is more heat resistant than regular glass.

Holyreefer · 09-26-2003, 11:08 PM

The problem with having a glass top is that the oxygen exchange will be lowered.

GrimReapr1 · 09-27-2003, 10:01 AM

I never that about that, thanks for bringing that up. In my opinion that water falling down the overflow, the skimmer, and through the wet dry will be a significant enough to make sure there will still be a proper gas exchange... The glass cover will also have 2 small openings so i guess air can also go in. But again thank you for that point.

09-24-2003, 10:16 PM	#1
GrimReapr1 New in Town Join Date: Sep 2003 Location: Miami Posts: 3	Quick MH help I just purchased some used MH's with ballast and socket. It's 2 MH 6,500k lights, 175 WATT a peice. Now my canopy is a small one, bit fitting the MH lights i still have room and all i need is a cover. The lights are a little old and i want HQI 10,000 k. So here comes the question. I want to buy a cover, glass seems to be my only option, but since I am using HQI, does it have to be UV protected glass? The lights will be about 1-2" away from the glass, i know it's very close but i will be running some good ventilation and i have a chiller for the water. Any input on the cover would be very helpful. Tank: 55 gallon Reef (48 x 13 x 21) 2 175 WATT, 6,500k MH 2 96 WATT PC Auto top off

09-25-2003, 02:23 PM	#2
Ninong Moderator Join Date: Jun 2000 Location: Louisiana Posts: 19,677	Hi GrimReapr1, welcome to Reefland! Regular tempered glass will work fine as a UV absorbing shield. My Aquastarlight fixture uses 3/16" tempered glass. Tempered glass is more heat resistant than regular glass. __________________ Ninong

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09-26-2003, 11:08 PM	#3
Holyreefer Just Moved In Join Date: Sep 2003 Location: Wisconsin Posts: 7	The problem with having a glass top is that the oxygen exchange will be lowered.

09-27-2003, 10:01 AM	#4
GrimReapr1 New in Town Join Date: Sep 2003 Location: Miami Posts: 3	I never that about that, thanks for bringing that up. In my opinion that water falling down the overflow, the skimmer, and through the wet dry will be a significant enough to make sure there will still be a proper gas exchange... The glass cover will also have 2 small openings so i guess air can also go in. But again thank you for that point.

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