par question, 20k vs 15k

[Rig]

Hi,

I currently have a 150W de xde 20k over my tank with no supplementation and I'm happy with the color. I see that this 15k lamp has just come out and it seems that it also looks nice without supplementation, based on what others have said. I'm basically just looking to get better growth out of my corals, and was wondering if a 15k bulb put out more par than a 20k? Thanks.

Regards,
Todd

[charlie]

I can't find the link to Sanjay's tests, but I think that you would probably get more par with the 15k. I know that 20k's don't have much on the par scale.
Maybe someone could pitch in here with that link, I'll keep looking in between!!

[charlie]

http://www.reeflightinginfo.arvixe.com/index.htm
here is a link to his website where you can search to your hearts content. HTH

[Rig]

http://www.reeflightinginfo.arvixe.com/index.htm
here is a link to his website where you can search to your hearts content. HTH

Thats a great website.

I'm comparing my XM XDE 20k 150W DE bulb to the Iwasaki 50k 150W DE bulb
and notice that PPFD jumps from 23 to 41 with the 50k. Is this the same as par? Does it basically mean that the 50k is twice as good in terms of coral growth compared to the 20k? The PPFD is only 42 with a 250W version of the same 20k bulb, so what I'm guessing is putting in the iwasaki 50k would be equivalent to upgrading to a 250W version of my current bulb?

Thanks

[charlie]

I have never seen or heard of a 50K bulb. I don't think I've ever seen one on the shelves anywhere. Are you sure you read that right?

[Reefland]

It is the name that Iwasaki has given their 150w DE bulb; never seen them personally though...

[Rig]

yeah right here:

http://www.premiumaquatics.com/Merch..._Code=mh70-150


is ppfd = par?