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Old 11-12-2010, 02:05 PM
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No significant correlation between bulb age (or spectrum) and algae growth in my experience. Water quality (nutrient levels) dictates algae growth, not quantity or spectrum of light.

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Originally Posted by Tyler Werbowski View Post
I understand that older bulb lose intensity and there's a slight spectrum change. I've heard that old MH bulbs can be a contributing factor to unwanted algae growth. Could someone explain the theory behind algae growth?
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