Algae & Lights

[::pete::]

When a bulb gets old, not sure on the change though.

[Richard]

You'll get more algae with 10K's if nutrient levels and such are right for nuisance algaes. Sometimes people get a bloom and then it plays itself out. What type of algae?

[GaryP]

What Richard said.

When you change bulbs there is often a large increase in par value. There is huge difference going from old 20K to new 10K. I had the same thing happen when I went from 14K to 10K. The bulbs are not the culprit, the nutrients are. The increase in light output just increases the effect of the nutrients.

Gary

[GaryP]

Your growth should go way up with the 10K bulbs. That's the problem with 20K, great color, but little gorwth. I would look at them as more of a supplement bulb, not a primary bulb. They serve the same purpose as the VHO actinics in my system.

Gary