I started out with 10Ks and went with 14ks when it was time to replace the bulbs. I got much better SPS growth with the 10ks, but I was not convinced. I replaced the 14s with 12ks with much the same result. After about six months, I went back to the 10ks and thats where I intend to stay. I did not notice much difference in the color.
On 20" deep you could go 150 @10K especially BB. For 14-20K I would shoot for 250 as there are more options. Yes you can swap out bulbs. I would see which ballast it's running the plug bulbs into sanjays site to see where the par falls.
everything i know about the fixture is on that site i posted. i hate the price & its not the kelvins i was wanting. but i thought it would be best to go 250w. but if i can change out the 14k for 10k with no hazards i think it might work i didnt think you could do that i thought it was made only for 14k bulbs. at least thats what i was always told
Someone please correct me if I am wrong, but I believe the 10K, 12K, 14K, 20K is just the spectrum of light the bulb emits and has nothing to do with wattage. Ballasts are designed for a particular wattage (150W, 175W, 250W, 400W) and should be not used with other than their intended wattage bulb. If you have a 250W ballast, you could use 10K, 12K, 14K, etc., just so long as the bulb is 250W.
ok i seen that Dr.Fosters gives compatibility of bulbs at 250w or what ever & what kelvins you can use in what ballast, select a light fixture & click '' see compatible bulbs'' there it shows all the bulbs that can be used on that ballast, Marine Depot told me a little differently, they said as long as the wattage is the same its fine
Nope. Some ballasts are pulse start, electric, magnetic and HQI. Which will not fire all 250 watt bulbs. You have to do some homework to see what will work. Here is a good site and gives par and temp readings also once you figure out how to work it, it will help with what bulbs will fire with what ballasts as if it's not listed, it didn't work Don't get confused, the best par is with over driven SE bulbs on hqi ballast, which decreases the bulb life