Double ended/single ended mhs uv protection

BReaTH · 02/02/2008, 08:22 AM

I wonder why generally most of the single ended mhs have uv protection and double ended ones does not?
Anyone has any idea? Im stuck here..

BReaTH · 02/02/2008, 10:39 AM

No ideas?

DarG · 02/02/2008, 11:09 AM

Cause that's the way it is? ...

I dont know why exactly but until you satisfy your curiosity just know that you need to use the glass shield with DE lamps and you dont with SE lamps. In fact, most SE pendants dont even include one. All DE pendants and fixtures that I know of do include the glass. The DE lamps are rated for use only in enclosed fixtures with UV filtering glass shield.

kilmca · 02/02/2008, 01:09 PM

Info from marinedepot.com product.

"Do I need a cover shield between the lamp and the aquarium?
Metal halide lamps produce a large amount of UV and also have a potential of exploding. The single ended metal halide lamps have an outer jacket which eliminates most of the UV. However, they have an inherent risk of exploding and UL requires metal halide lamps to be enclosed. On double ended lamps there is no UV shield. Double ended lamps must have a glass shield or major eye injuries including blindness may occur."

rbursek · 02/02/2008, 04:45 PM

Good to know, with my 250w10KSEMh and I have a lens, I got sun glasses for the fish until I went with 14K's. LOL
Bob

BReaTH · 02/09/2008, 03:06 AM

So why is it that wayStill donÂ´t get it :- )?DonÂ´t they have the technology to produce de bulbs uv protected?

datablitz · 02/09/2008, 08:00 AM

they dont have an outer glass casing like SE bulbsand couldnt have one because of how the socket is designed

DarG · 02/09/2008, 10:52 AM

Many of the DE bulbs actually do have some type of UV coating on the outer glass envelope but it doesnt stop all of the UV. It is a safety precaution only, in case the fixtures glass shield should break most of the UV (UV - C I believe it is) is blocked by the bulbs outer glass but not all. The glass still needs to be replaced. The bulbs are still only rated for enclosed fixtures with a glass lens.

BReaTH · 02/11/2008, 04:26 PM

Thank you all for your interest

gotbags-10 · 02/11/2008, 07:00 PM

so what would be the better bulb choice? Hqi or se? Seing as the uv glass shield takes a considerable amount out of the shield would it be worth while to go se?

coralreefdoc · 07/03/2012, 12:57 PM

That opens up a whole other can of worms/opinions ... Search SE vs DE and

I prefer SE but use DE myself

sirreal63 · 07/03/2012, 01:15 PM

Bringing back a 4 year old thread is opening a can of worms.

It has always been a good discussion, both do work as intended and ends up just being a preference. I like DE but run 150's a lot more than I run 250's so I don't have a choice there. Some bulbs are not offered in DE, such as the 250 watt Radium, which is the most popular bulb around.

coralreefdoc · 07/03/2012, 01:34 PM

Just realized that, Jack

One of the primary reasons I prefer SE, bulb selection/variability.

In regards to digging up old threads, I dont see why many are against it ... Often times it revives great topics/viewpoints to the forefront, not that this was necessarily one of those times

sirreal63 · 07/03/2012, 01:47 PM

It depends on the thread, I have a large amount of old threads bookmarked and call them up as needed. A thread full of bad information should be left to die of old age but some of the really good ones from the past should never die, mostly because people have been asking the same questions daily for longer than I have been here. :-)

coralreefdoc · 07/03/2012, 01:51 PM

Not insinuating that is/was your stance on the subject either, Jack. Just expressing interest as it seems many potentially great threads/topics, and sunsequently their prospective insight/information, get buried due to people being reluctant/apprehensive to post

coralreefdoc · 07/03/2012, 02:02 PM

Quote:

Originally Posted by sirreal63

It depends on the thread, I have a large amount of old threads bookmarked and call them up as needed. A thread full of bad information should be left to die of old age but some of the really good ones from the past should never die, mostly because people have been asking the same questions daily for longer than I have been here. :-)

Seems we were writing simultaneously ...

Agree. Lets put this one back to sleep

sirreal63 · 07/03/2012, 02:10 PM

Isn't that the truth. I like threads like this one, it gets people thinking and that is what brings about change. My mentor in business told me something about 30 years ago that has stuck. "If you are doing the same thing for more than a year, you need to look at it, you may have missed an opportunity to improve it."

I think the saddest part of this hobby is the people who have been in it a long time don't post or have been "moved on". Passion in the hobby is a great thing, so I never mind heated discussions and thinking that goes against the grain of conventional wisdom is always welcomed in my eyes. It would be easy to say that the hobby was more fun when I started, but the reality is the hobby has never been better than it is right now.

I am considering LED's but IMHO there is no substitute for a 250 Watt Radium, even if it is a DE bulb housed in a SE body.

coralreefdoc · 07/04/2012, 01:23 AM

Speaking of which, and perhaps we could make this threads space/data usage useful with this one, why doesnt Radium make a DE bulb, Jack ? Undoubtedly the demand is there; I seem to remember a problem with logistics when researching this topic years ago, however I dont recall why specifically ...

sirreal63 · 07/04/2012, 07:32 AM

I wish I knew, but I would be running them if they did.

02/02/2008, 08:22 AM	#1
BReaTH Registered Member Join Date: Jun 2007 Posts: 79	Double ended/single ended mhs uv protection I wonder why generally most of the single ended mhs have uv protection and double ended ones does not? Anyone has any idea? Im stuck here..

07/03/2012, 01:15 PM	#12
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	Bringing back a 4 year old thread is opening a can of worms. It has always been a good discussion, both do work as intended and ends up just being a preference. I like DE but run 150's a lot more than I run 250's so I don't have a choice there. Some bulbs are not offered in DE, such as the 250 watt Radium, which is the most popular bulb around. __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

07/03/2012, 01:47 PM	#14
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	It depends on the thread, I have a large amount of old threads bookmarked and call them up as needed. A thread full of bad information should be left to die of old age but some of the really good ones from the past should never die, mostly because people have been asking the same questions daily for longer than I have been here. :-) __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

07/03/2012, 02:10 PM	#17
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	Isn't that the truth. I like threads like this one, it gets people thinking and that is what brings about change. My mentor in business told me something about 30 years ago that has stuck. "If you are doing the same thing for more than a year, you need to look at it, you may have missed an opportunity to improve it." I think the saddest part of this hobby is the people who have been in it a long time don't post or have been "moved on". Passion in the hobby is a great thing, so I never mind heated discussions and thinking that goes against the grain of conventional wisdom is always welcomed in my eyes. It would be easy to say that the hobby was more fun when I started, but the reality is the hobby has never been better than it is right now. I am considering LED's but IMHO there is no substitute for a 250 Watt Radium, even if it is a DE bulb housed in a SE body. __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

07/04/2012, 07:32 AM	#19
sirreal63 Go Spurs Go!!! Join Date: Dec 2004 Location: Meadowlakes Texas Posts: 13,357	I wish I knew, but I would be running them if they did. __________________ Jack No One has ever been seriously injured by using the search function. Alcohol, Tobacco and Firearms should be a convenience store, not a government agency. Current Tank Info: Reefing the Pentagon.

02/02/2008, 10:39 AM	#2
BReaTH Registered Member Join Date: Jun 2007 Posts: 79	No ideas?

02/02/2008, 11:09 AM	#3
DarG Registered Member Join Date: Dec 2006 Posts: 5,515	Cause that's the way it is? ... I dont know why exactly but until you satisfy your curiosity just know that you need to use the glass shield with DE lamps and you dont with SE lamps. In fact, most SE pendants dont even include one. All DE pendants and fixtures that I know of do include the glass. The DE lamps are rated for use only in enclosed fixtures with UV filtering glass shield.

02/02/2008, 01:09 PM	#4
kilmca Registered Member Join Date: Dec 2005 Location: OR City, OR Posts: 203	Info from marinedepot.com product. "Do I need a cover shield between the lamp and the aquarium? Metal halide lamps produce a large amount of UV and also have a potential of exploding. The single ended metal halide lamps have an outer jacket which eliminates most of the UV. However, they have an inherent risk of exploding and UL requires metal halide lamps to be enclosed. On double ended lamps there is no UV shield. Double ended lamps must have a glass shield or major eye injuries including blindness may occur."

02/02/2008, 04:45 PM	#5
rbursek Moved On Join Date: Jun 2006 Location: germantown,wi Posts: 2,339	Good to know, with my 250w10KSEMh and I have a lens, I got sun glasses for the fish until I went with 14K's. LOL Bob

02/09/2008, 03:06 AM	#6
BReaTH Registered Member Join Date: Jun 2007 Posts: 79	So why is it that wayStill donÂ´t get it :- )?DonÂ´t they have the technology to produce de bulbs uv protected?

02/09/2008, 08:00 AM	#7
datablitz Moved On Join Date: Dec 2006 Location: Blacklick, Ohio Posts: 347	they dont have an outer glass casing like SE bulbsand couldnt have one because of how the socket is designed

02/09/2008, 10:52 AM	#8
DarG Registered Member Join Date: Dec 2006 Posts: 5,515	Many of the DE bulbs actually do have some type of UV coating on the outer glass envelope but it doesnt stop all of the UV. It is a safety precaution only, in case the fixtures glass shield should break most of the UV (UV - C I believe it is) is blocked by the bulbs outer glass but not all. The glass still needs to be replaced. The bulbs are still only rated for enclosed fixtures with a glass lens.

02/11/2008, 04:26 PM	#9
BReaTH Registered Member Join Date: Jun 2007 Posts: 79	Thank you all for your interest

02/11/2008, 07:00 PM	#10
gotbags-10 Registered Member Join Date: Jan 2007 Location: Indy Posts: 263	so what would be the better bulb choice? Hqi or se? Seing as the uv glass shield takes a considerable amount out of the shield would it be worth while to go se?

07/03/2012, 12:57 PM	#11
coralreefdoc Moved On Join Date: Feb 2003 Location: Cavitation Bubble Posts: 776	That opens up a whole other can of worms/opinions ... Search SE vs DE and I prefer SE but use DE myself

07/03/2012, 01:34 PM	#13
coralreefdoc Moved On Join Date: Feb 2003 Location: Cavitation Bubble Posts: 776	Just realized that, Jack One of the primary reasons I prefer SE, bulb selection/variability. In regards to digging up old threads, I dont see why many are against it ... Often times it revives great topics/viewpoints to the forefront, not that this was necessarily one of those times

07/03/2012, 01:51 PM	#15
coralreefdoc Moved On Join Date: Feb 2003 Location: Cavitation Bubble Posts: 776	Not insinuating that is/was your stance on the subject either, Jack. Just expressing interest as it seems many potentially great threads/topics, and sunsequently their prospective insight/information, get buried due to people being reluctant/apprehensive to post

07/04/2012, 01:23 AM	#18
coralreefdoc Moved On Join Date: Feb 2003 Location: Cavitation Bubble Posts: 776	Speaking of which, and perhaps we could make this threads space/data usage useful with this one, why doesnt Radium make a DE bulb, Jack ? Undoubtedly the demand is there; I seem to remember a problem with logistics when researching this topic years ago, however I dont recall why specifically ...