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**Damon** · 11-15-2007, 01:41 PM

Not all bulbs are created equally. Also bulb life has a lot to do with par and color. Older bulbs may not show a color change (some do) but the spectrum does change. 18000K may appear purple to you but may appear bluish to others. K is the color we perceive and everyone's eyes are different. I would still change it to a lower K (6500K-10000K) and change all bulbs every 6 months for peak efficiency.

11-15-2007, 01:41 PM	#5
Damon Aquatic Naturalist Join Date: Jan 2005 Location: Dayton, Ohio Age: 32 Posts: 14,982	Not all bulbs are created equally. Also bulb life has a lot to do with par and color. Older bulbs may not show a color change (some do) but the spectrum does change. 18000K may appear purple to you but may appear bluish to others. K is the color we perceive and everyone's eyes are different. I would still change it to a lower K (6500K-10000K) and change all bulbs every 6 months for peak efficiency. __________________ For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow. Member of the AGA (Aquatic Gardner's Association) Member of the IBC (International Betta Congress)