I can surmise you don’t understand Kelvin and few people do. There are 3 temperature scales Fahrenheit, Celsius or Centigrade and Kelvin. Kelvin is the temperature scale used mostly in physics for extreme temperatures. At the physically impossible-to-reach temperature of zero Kelvin, or minus...

So I was looking on the web (lol) to see what kelvin rating does SPS do well in. From some other forums they gave me an example that LPS do well in 14k so I was looking for something similar for SPS. I found this article/blog and wanted to see what your guys opinion. From my understanding LEDs...

I have a 75g I am setting up. I will be building the lights myself so the sky is the limit. I want to be able to put anything in the tank (sps, lps, softies, etc) not necessarily all at the same time. I just don't want to spend the money to build it to then be limited later. I will be using...

The background knowledge that I "think" I know :) is this at 6500k lighting simulates natural sunlight, corals love this to grow, but the problem is that their colors are drab and brownish. Fish colors appear quite normal and I'm assuming that this is what most tanks are photographed under...

Hey guys. I want to know your opinion on spectrum with these two companies. From what I've gathered online, I believe these china brand lights don't have the spectrum there saying they have. I know that eco tech has spent years dialing in there units and making them one of the truest spectrum...

I've recently gotten into the SW aquarium hobby and I have a 15k MH bulb in a 40g tank. Well I wanted to buy a replacement bulb and I accidentally got a 10k. The tank is still cycling so it's not a big issue and the 15k still works. I'm just wondering when it does come time to change it, will it...

I just purchased a biocube 29 hqi system that has a 150 w coralife fixture. The bulb it came with is 14000k. I was wondering, when I change bulbs, which won't be for a while, should i change the kelvin rating? I only have softies and mushrooms now (because im waiting for the system to mature)...

I want to buy a light fixture off of ebay and it has a 50/50 mix of 10000K bulb and actinic lighting. I was wondering if actinic lighting is even beneficial for the growth of corals and invertebrates. I thought it was for looks or does it benefit the growth of coraline algae.

Whilst researching this on the web for my lil makeshift refugium.. Aka. gutted Seaclone skimmer, I stumbled across this very interesting comparison between two different types of bulbs and then the comparison to the different Kelvin ranges, complete with test and pics!!! Check it out. I...

First time poster, long time browser. I am getting new bulbs for my AP12 . I was wondering what is the best color temp to get? I just purchased this this tank used, it's well established, my water quality is perfect. I have lots of live rock with coraline algae, a maroon clown fish, CUC...

Ok this is a very confusing topic with all the different types of light out there i think a lot of us need help especially when everything revolves around making money any more. there are three things to pay attention to right, Par, kelvin or color temp., and watts which i don't think matters...

Trying to get info on what is best for a reef on kelvin in bulbs of chocie. I am asking this on a coral keeping aspect anemones not inculded. What is the correct amount of kelvin to consider in purchasing bulb. Do you go with the highest kelvin or do you stick with 10,000k bulbs? To input I am...

Hey ya'll, I'm new here but i've been reading along for awhile. I'm setting up a reef with a 400 watt metal halide and trying to decide on a kelvin rating. Do any of you keep plants around your aquarium? I have a indoor grow set up and I'm getting a new bulb for my current fixture to put on the...

Looking for some advice. I am about to purchase 3 icecap electronic ballasts. Does anyone have experience with these ballasts? If so, what do you recommend for bulbs? This is a new tank set up that I would like to avoid being limited on what I can put in the tank. Also, what are y'alls thoughts...

What makes fluorescent lights different colors? is it different mixes of gases? For that matter how do they get different colors in metal halides? Not that I wanted to change the colors of my bulbs:nuts: I just have an inquiring mind.

which is better for a reef tank, 10,000K or 20,000K lights?

Currently have on a 90gal show tank with chiller, 90% SPS 2- 48" (V HO, T12) Super Actinic R, 110W -URI / 2- 48" (VHO, T12) 10,000K Aquasun, 110W -UR 1- 20,000K Ushio - 400W / 1- 10,000 K ? - 400W Recommdations on what light Kelvin/brand to enhance growth and color.