Originally Posted by
bpro32
http:///forum/post/2991218
Do radiums come in anything besides 20,000k? That's all I've seen and they are $75 each.
Yes radium’s are a high color temp bulb. They are not 20 K however. You have to be carful when view color temp ratings. There is no standard. For example. A XM 20K and a ushio 20K look entirely different. Same goes for most bulbs.
When looking for a bulb you have to find one that give you both good growth AND a color that is pleasing to your eyes. When deciding on a bulb use the temp ratings as nothing more then a mere guide to give a very general idea as to what the color will be. The lower the number the more yellow it will be and the higher the number the more white/blue it will be.
Unfortunately for most people it is not a one purchase deal to find one that best suits there situation. Many times you will buy several different blubs before finding one that give the results you are looking for. I for one have been using MH for more then ten years and I have tried every bulb and ballast combo you can think of.
To me nothing makes a coral look nicer then a radium bulb they also give great growth. The color to the eye is very crisp white/blue. Most other higher temp bulbs are much to blue for my taste. The only down side for me is they are one of the more expensive bulbs and par/color shifts rapidly after around 7month. Slightly shorter life then some bulbs but the positives far outweigh the negatives IMO.
gl to ya.
PS: stay far away from those no name 40 dollar disscount bulbs you find on the internet. the term "you get what you pay for" applies when buying bulbs for your reef. your buying expensive corals so why risk them by purchasing a sub par lighting source? after all they are what will be keeping those expensive corals ALIVE.