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If your replacement bulbs were the same brand and color temp, then the intensities of the various wavelengths should be equal or greater for the new bulbs as compared to the old ones (within the variability of the bulb manufacturer). So the reduced hair algae would not be because the new bulbs have less intensity at certain wavelengths.
Therefore, the reduced hair algae is probably due to something else (beneficial xooxanthallae in the corals?) outcompeting the hair algae for nutrients, due to improved intensities at the preferred wavelengths of the xooxanthallae. The reduced hair algae is therefore a secondary effect, but a noticable effect just the same.
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Don
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