10000 k or 20000 k ???

e2k · 02/01/2006, 07:35 AM

10000 k or 20000 k ???
hi everyone

i have a question bout mh , i use Dymax MH 150 W black galaxy and use 2 of 10000 k bulb , but i don't like it color cause it seem to be yellow like sunlight , i want to change to use 20000 k
but my friend warn me that 20000k can use for short time and it can harm coral cause high spectrum , is it true ?? ......... (pls tell me cause i like the color of 20000 k)

swashbuckler · 02/01/2006, 08:13 AM

20k wont harm coral, all it does is make them look better.

however, it will reduce the amount of usable radiation delivered to them. and make them grow less- thats all..... however, you will need to change the bulb more often than 10k.

Bojan · 02/01/2006, 08:25 AM

According to my opinion 20000 K is too Blue, when the bulb is new. Try with 14000 K or 15000 K MH bulbs.

crazylegs · 03/03/2006, 08:25 AM

I have 150w 20k bulbs on my 18" high 60g. I have a mixed reef with sps, lps, and softies. I love the way 20k bulbs make the corals seem to glow. yes, my coral growth is slower, but i think it's worth it.

02/01/2006, 07:35 AM	#1
e2k Registered Member Join Date: May 2005 Posts: 12	10000 k or 20000 k ??? 10000 k or 20000 k ??? hi everyone i have a question bout mh , i use Dymax MH 150 W black galaxy and use 2 of 10000 k bulb , but i don't like it color cause it seem to be yellow like sunlight , i want to change to use 20000 k but my friend warn me that 20000k can use for short time and it can harm coral cause high spectrum , is it true ?? ......... (pls tell me cause i like the color of 20000 k)

02/01/2006, 08:13 AM	#2
swashbuckler Registered Member Join Date: Mar 2005 Location: Central VA Posts: 1,726	20k wont harm coral, all it does is make them look better. however, it will reduce the amount of usable radiation delivered to them. and make them grow less- thats all..... however, you will need to change the bulb more often than 10k. __________________ "Der Guten Tag Hop-Clop" -The Producers Current Tank Info: 40breeder, 150W AquaMedic Oceanlight, 190W VHO Superactinics, AquaC Remora, 5 gallon fuge.

02/01/2006, 08:25 AM	#3
Bojan Registered Member Join Date: Feb 2004 Location: Slovenia Posts: 969	According to my opinion 20000 K is too Blue, when the bulb is new. Try with 14000 K or 15000 K MH bulbs.

03/03/2006, 08:25 AM	#4
crazylegs Registered Member Join Date: Aug 2005 Location: Houston, TX. Posts: 174	I have 150w 20k bulbs on my 18" high 60g. I have a mixed reef with sps, lps, and softies. I love the way 20k bulbs make the corals seem to glow. yes, my coral growth is slower, but i think it's worth it.