400w XM 20k...is there a difference in these bulbs

ptreef · 09/04/2014, 08:24 AM

SO whats up with these?

I just ordered a new pair and got the ones with the fat buldge....
Order the other pair over a yr ago?

usmc121581 · 09/04/2014, 08:36 AM

Where did you order from?

ptreef · 09/04/2014, 08:40 AM

Premium Aquatics got that fatty's, last week on sale
Not sure on the first pair. Have to check...

color and output looks to be the same

ptreef · 09/05/2014, 08:15 AM

bump?

PaulErik · 09/05/2014, 12:57 PM

The new lamp is a newer design. They are the same lamp. The lamp manufacturer changed the bulb shape to reduce the outer bulb temperature. Some 400 watt lamps had issues with the outer bulb melting or deforming.

ptreef · 09/05/2014, 01:27 PM

So the fat one is new style? How new? I thought I remember seeing that fat bulb a few yrs back. But may have been a differnt brand??

PaulErik · 09/05/2014, 01:34 PM

The lamp manufacturer came out with the new fat bulb a while ago. Some places have a mix of the old and new bulbs. The internals are identical. A few other lamp manufacturers also have changed to the fatter bulb design.

ptreef · 09/05/2014, 02:19 PM

Cool. Thanks

09/04/2014, 08:24 AM	#1
ptreef Registered Member Join Date: Nov 2012 Posts: 746	400w XM 20k...is there a difference in these bulbs SO whats up with these? I just ordered a new pair and got the ones with the fat buldge.... Order the other pair over a yr ago?

09/04/2014, 08:36 AM	#2
usmc121581 Where am I? Join Date: Dec 2006 Location: Abingdon, maryland Posts: 1,671 Blog Entries: 1	Where did you order from? __________________ I prefer not to think before I speak, I like to be just as surprised as everyone else by what comes out of my mouth. Current Tank Info: I have a 180 gal mostly LPS corals, it contains 1 Val. Tang, 1 yellow striped clown fish, 3 percula clownfish, a blood shrimp, cleaner shrimp and a sand shifting goby, 5 pajama cardinals, 1 green chromis. Also a 75 gal. sump/fug.

09/04/2014, 08:40 AM	#3
ptreef Registered Member Join Date: Nov 2012 Posts: 746	Premium Aquatics got that fatty's, last week on sale Not sure on the first pair. Have to check... color and output looks to be the same

09/05/2014, 08:15 AM	#4
ptreef Registered Member Join Date: Nov 2012 Posts: 746	bump?

09/05/2014, 12:57 PM	#5
PaulErik Premium Member Join Date: Dec 2000 Location: North Charleston, SC Posts: 1,703	The new lamp is a newer design. They are the same lamp. The lamp manufacturer changed the bulb shape to reduce the outer bulb temperature. Some 400 watt lamps had issues with the outer bulb melting or deforming.

09/05/2014, 01:27 PM	#6
ptreef Registered Member Join Date: Nov 2012 Posts: 746	So the fat one is new style? How new? I thought I remember seeing that fat bulb a few yrs back. But may have been a differnt brand??

09/05/2014, 01:34 PM	#7
PaulErik Premium Member Join Date: Dec 2000 Location: North Charleston, SC Posts: 1,703	The lamp manufacturer came out with the new fat bulb a while ago. Some places have a mix of the old and new bulbs. The internals are identical. A few other lamp manufacturers also have changed to the fatter bulb design.

09/05/2014, 02:19 PM	#8
ptreef Registered Member Join Date: Nov 2012 Posts: 746	Cool. Thanks