I think a picture would be worth a thousand posts on this one if anyone is able.

Al

here here

I checked my light and the nipple was pointing up. I changed it so that it is on th side (horizontally) hopefully the light will turn white :confused:

the whole nipple thing is bunk and was proved in a following articke about a month after that. I have also burnt them in both ways and it makes no difference.

Steve

There was a couple of articles on this topic by Richard Harker in Advanced Aquarist (maybe the ones you were refering to Steve).


"Nipple Nonsense Revisited"
http://advancedaquarist.com/issues/mar2002/product.htm

"Nipple Nonsense"
http://advancedaquarist.com/issues/j...ductreview.htm


Alex

Would someone be so kind as to post a picture of this elusive nipple please :question: :question:

As to yellow coloration, and nipples. My bulb is in a pendant, so it is vertical, and if what I think is the nipple, it would be sideways. My bulb is on a new M57 ballast, and burned pee yellow for a couple of days. Today it has burned with the correct color all day. :biggrin:

Here's a picture of my newly setup 20H nano. under the new 175W bulb.

http://members.shaw.ca/rcipema/newbulb.jpg

Here's the same tank nine hours later. That is how the camera thinks it looks. It does not look that bad to me.
http://members.shaw.ca/rcipema/newbulbtwo.jpg

And here's the tank under 2X65W PC'c (one 10000K, the other actinic)

http://members.shaw.ca/rcipema/newbulbthree.jpg

Not hard to guess which way I will be going until I get this bulb orientation cured. :biggrin:

This is a picture from the article.

http://advancedaquarist.com/issues/mar2002/newbulb.htm

Bob, it is the pinched off part when they form the inner bulb as you thought previosly. the speculation was that the thicker part of the glass made the light less blue but further tests showed it didn't matter.

for what its worth a fan blowing on the bulb does affect the output color but I doubt most people would notice it.


Steve

yup they are.. that actualy shows that the color should be better with the nipple down (this is PAR output only as color was almost identical) so we should do the oposit of what Venkiw asked, BUT this is also assuming that you do not use a reflector, sence I have tested 6 different bulbs this way my self I can tell you that when you use a reflector of good quality there is virtualy no difference.


Bob, do you mean that your bulb are hanging up and down so that the screw part is up? if so you should try them horazontaly as these bulbs are not made for verticle use and this could be the source of your yellow on the AB's.

Steve

[quote="StirCrazy"]That is the way they are oriented in the Coralife pendant. I have no choice in the matter, because that is the way the pendant is made :sad: