20kK MH bulb

[Rocky99]

if any one could advise.

i have a 150W MH fixture above my 3x1.5x2(H) tank. as i do not have a hood, the MH is the only piece of lighting available for my tank. i'm using a 10kK bulb and it gives my tank a very yellowish appearance. may i know what will happen to my corals if i change over to a 20kK bulb without any T5 supplement. i keep and intend to keep only LPS.

thanks in advance

[ervine]

Hm.. 150W for a 3x1.5x2 is a little on the low side, more so if you switch over to 20k... my 2.5x1.5x2 uses 250W of 20k and 2x24W of 10k T5s...

I was originally running 250W of 20k MH only and the corals (LPS) were OKAY but not that super.. made the upgrade recently so still waiting for results...

[strat]

Since you are keeping lps only, you can supplement with t5 blue actinics to balance out the color.

Alternatively, you can change your bulb to 14k.

This will give you a blue-ish look.

[Rocky99]

Hm.. 150W for a 3x1.5x2 is a little on the low side, more so if you switch over to 20k... my 2.5x1.5x2 uses 250W of 20k and 2x24W of 10k T5s...

I was originally running 250W of 20k MH only and the corals (LPS) were OKAY but not that super.. made the upgrade recently so still waiting for results...

ic..... i am currently limited to one choice of bulb and one kind of lighting only cos i got no hood.... supplementing with actinics won't be an option for me in the near future cos i got no space to mount them above my tank...

my tank is narrow and my MH fixture so so fat.... i guess i'll try changing to a 250W 20kK.

no choice, got to compromise a bit... thanks...

pls update me with your results of using a 20kK 250W.

[Rocky99]

Since you are keeping lps only, you can supplement with t5 blue actinics to balance out the color.

Alternatively, you can change your bulb to 14k.

This will give you a blue-ish look.

i was thinking of using a 14k too... but i notice that light that goes into the tank appear less blue (more yellow) than it is before going in. for instance, last time my slightly yellowish 6500k that goes in comes out much yellowish. then a white 10kK goes in and appears slightly yellowish... so i suspect that if the same thing may happen for a 14kK. so that's why i thought a blue bulb may be good.... it'd be nice if they haf something like 17kK

thanks bro.....