29 Gallon Nanocube: 150 Watt HQI-14,000k Question.... Need to replace bulb. I can get on ebay a 150 Watt HQI but 15,000k or 20,000k. I know "k" stands for kelvin and is a unit of measure. How will 1,000k to 6,000k increase in kelvin affect my reef system? Will it be hotter? I realy don't need anymore heat in my system. Should I stay with the 14,000k? Also, the light on ebay is $19.99 plus shipping. From JBJ it's $55 and up.