ok i have a light fixture i got stock from the kit i bought at walmart. the 29g complete setup they sell. well i want to get a new bulb for it but dont know how high i can go. the store by me sell bulb by the k rating so how how can i go. 6500k? 4100? anyone know. oh and the bulb i have is a 17watt that came with it
As long as you use the same wattage of bulb, you can choose any color you want. The higher the Kelvin temperature, the bluer the light will be. 6000K is white looking light (usually for plants), 4000K is a little redder and 10,000-14,000 is a little bluer (can be used for saltwater). 20,000K (Actinic) is very blue and is used for deep water corals.