Just repalced 14k to a 20k

big tanner · 11-20-2008, 08:03 PM

I love how all the corals are now ''glowing'' more. Especially all the greens, blues, and oranges. However, I can tell a big difference in brightness. The 14k bulb literally lit the whole bedroom up. My question is, since both bulbs are 250w, are they both putting out the same amount of light for my corals even though the 20k doesn't appear to be as bright as the 14k was?

XBwlr · 11-20-2008, 09:00 PM

No.
It has to do with PAR. The higher kelvin, the lower the PAR value.

I don't remember what PAR stands for, but it has to do with the amount of light the corals use.

Opsanus tau · 11-20-2008, 09:16 PM

You should really use a quantum meter when doing such a switch, you would not belive how much LESS light your corals are receiving (with those 20k bulbs)...I was blown away by the difference between a 14 and 20k....(we're talking about 100 microeinsteins difference in some cases!!!!!!!!!!!!!!).(IMO/IME....with my quantum meter)

I would borrow a meter from somewhere if you don't have one ,and consider lowering your lights,(if that is physicaly possible)-Dave

big tanner · 11-20-2008, 09:23 PM

My 14k bublb was less than three months old. You guys have got me scared now. I'm worried I might need to put it back in.

big tanner · 11-20-2008, 09:46 PM

What do you guys think? Should I put the 14k back in or what? By the way, the light is an Icecap 250w pendant and the bulb is a double ended hqi. I have this light on a 29 gallon. I also put a tridacnea clam in this past Saturday. It may like the 14k better. Let me know guys. I didn't know any better

XBwlr · 11-20-2008, 09:52 PM

29 gallon... what is that? 20" tall?

If so, then you should be alright. When you said 250w I was thinking a bigger / taller tank.

nstiesi · 11-20-2008, 09:54 PM

Sorry, never used MH lighting myself.....

all I have to add is PAR = Photosynthetically Active Radiation

Photosynthetically active radiation - Wikipedia, the free encyclopedia

big tanner · 11-20-2008, 10:18 PM

Mam I'm depressed now. Even at wholesale, that was an expensive bulb. It's a Blue Life SPS 250w 20k. And as sad as I am to say it, I believe I like the looks of the 14k better. The water just looked so much cleaner and clearer with that 14k. I'm thinking about changing it back. Retail price on the bulb is $64. If I decide to take it out, anyone wanna do any trading on some frags?

11-20-2008, 08:03 PM	#1 (permalink)
big tanner Serpent Star Join Date: Jan 2005 Location: Cleveland, Tennessee Posts: 220 View Gallery Karma Komment	Just repalced 14k to a 20k I love how all the corals are now ''glowing'' more. Especially all the greens, blues, and oranges. However, I can tell a big difference in brightness. The 14k bulb literally lit the whole bedroom up. My question is, since both bulbs are 250w, are they both putting out the same amount of light for my corals even though the 20k doesn't appear to be as bright as the 14k was?

11-20-2008, 09:00 PM	#2 (permalink)
XBwlr Elegance coral Join Date: Nov 2004 Location: Kingston, Ohio Posts: 1,224 View Gallery Karma Komment	Re: Just repalced 14k to a 20k No. It has to do with PAR. The higher kelvin, the lower the PAR value. I don't remember what PAR stands for, but it has to do with the amount of light the corals use. __________________ -Scott "Do I really look like a guy with a plan?"

11-20-2008, 09:16 PM	#3 (permalink)
Opsanus tau Midas Blenny Join Date: Dec 2007 Location: Keys Posts: 91 View Gallery Karma Komment	Re: Just repalced 14k to a 20k You should really use a quantum meter when doing such a switch, you would not belive how much LESS light your corals are receiving (with those 20k bulbs)...I was blown away by the difference between a 14 and 20k....(we're talking about 100 microeinsteins difference in some cases!!!!!!!!!!!!!!).(IMO/IME....with my quantum meter) I would borrow a meter from somewhere if you don't have one ,and consider lowering your lights,(if that is physicaly possible)-Dave

11-20-2008, 09:23 PM	#4 (permalink)
big tanner Serpent Star Join Date: Jan 2005 Location: Cleveland, Tennessee Posts: 220 View Gallery Karma Komment	Re: Just repalced 14k to a 20k My 14k bublb was less than three months old. You guys have got me scared now. I'm worried I might need to put it back in.

11-20-2008, 09:46 PM	#5 (permalink)
big tanner Serpent Star Join Date: Jan 2005 Location: Cleveland, Tennessee Posts: 220 View Gallery Karma Komment	Re: Just repalced 14k to a 20k What do you guys think? Should I put the 14k back in or what? By the way, the light is an Icecap 250w pendant and the bulb is a double ended hqi. I have this light on a 29 gallon. I also put a tridacnea clam in this past Saturday. It may like the 14k better. Let me know guys. I didn't know any better

11-20-2008, 09:52 PM	#6 (permalink)
XBwlr Elegance coral Join Date: Nov 2004 Location: Kingston, Ohio Posts: 1,224 View Gallery Karma Komment	Re: Just repalced 14k to a 20k 29 gallon... what is that? 20" tall? If so, then you should be alright. When you said 250w I was thinking a bigger / taller tank. __________________ -Scott "Do I really look like a guy with a plan?"

11-20-2008, 09:54 PM	#7 (permalink)
nstiesi Sea Pen Join Date: May 2008 Location: Hollywood, FL Posts: 334 View Gallery Karma Komment	Re: Just repalced 14k to a 20k Sorry, never used MH lighting myself..... all I have to add is PAR = Photosynthetically Active Radiation Photosynthetically active radiation - Wikipedia, the free encyclopedia

11-20-2008, 10:18 PM	#8 (permalink)
big tanner Serpent Star Join Date: Jan 2005 Location: Cleveland, Tennessee Posts: 220 View Gallery Karma Komment	Re: Just repalced 14k to a 20k Mam I'm depressed now. Even at wholesale, that was an expensive bulb. It's a Blue Life SPS 250w 20k. And as sad as I am to say it, I believe I like the looks of the 14k better. The water just looked so much cleaner and clearer with that 14k. I'm thinking about changing it back. Retail price on the bulb is $64. If I decide to take it out, anyone wanna do any trading on some frags?

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