Quick bit of info for those with Ushio UHI-S400DDs

tjh · 13th June 2006, 12:50 AM

I was just reading over the spec sheet for the bulbs (http://www.ushio.com/Files/UltraArc.pdf)and noticed something that I don't think has been posted on here before: that they should be mounted vertically for the longest life span. According to the sheet you can get 20000 hours if mounted vertically, and only 15000 if mounted horizontally.

Just thought I'd mention it for anyone who is about to mount theirs.

hailrazer · 13th June 2006, 02:59 AM

The problem is that it's VERY hard to keep the arc stable with it vertical. The arc wants to jump around and change colors.

tjh · 13th June 2006, 07:00 AM

Hmm. Didn't know that. Is there any compromise for it? Like doing it at a 45 degree angle or something?

Also do you know if it would make a difference if mounted hanging from the base (base up top) or just standing straight up (base on bottom)?

13th June 2006, 12:50 AM	#1
tjh diyAudio Member Join Date: Dec 2004 Location: RI, USA	Quick bit of info for those with Ushio UHI-S400DDs I was just reading over the spec sheet for the bulbs (http://www.ushio.com/Files/UltraArc.pdf)and noticed something that I don't think has been posted on here before: that they should be mounted vertically for the longest life span. According to the sheet you can get 20000 hours if mounted vertically, and only 15000 if mounted horizontally. Just thought I'd mention it for anyone who is about to mount theirs. __________________ __________________ Status: 6/12/06: Redesigning everything, finally putting in the Ushio S400DD.

13th June 2006, 07:00 AM	#3
tjh diyAudio Member Join Date: Dec 2004 Location: RI, USA	Hmm. Didn't know that. Is there any compromise for it? Like doing it at a 45 degree angle or something? Also do you know if it would make a difference if mounted hanging from the base (base up top) or just standing straight up (base on bottom)? __________________ __________________ Status: 6/12/06: Redesigning everything, finally putting in the Ushio S400DD.

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13th June 2006, 02:59 AM	#2
hailrazer diyAudio Member Join Date: Sep 2005	The problem is that it's VERY hard to keep the arc stable with it vertical. The arc wants to jump around and change colors.

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