Effects of too much light or old bulbs?

[sphelps]

Too much light - bleached corals, lower light LPS and soft corals may also shrivel up. Typically with proper acclimation not an issue.

Old bulbs - Obviously lower light output for one, shift in spectrum which can cause more algae growth depending on the bulbs. Color can also suffer and if old bulbs are changed out all at once you can shock the corals.

[Reef Puffer]

i have a small tank. i had 4 h0 t5 bulbs. i switched out two bulbs for a 150w hqi with pc's. the hqi is an old bulb. one month later red cyno EVERYWHERE. loose the old halides IMO!! other than online i cant find new bulbs anywhere either... just my luck tho.