One at least every 2ft of tank.

I like the AM sexy light that has 3x 150 W and 2x 70 w in the middle.

This gives awesome coverage, but it has less light than say 2-3x 250W.

We do not need more watts, we need more coverage from more smaller wattage points.

The PC's will help in this regard, but you will see that 250's are not going to give the most even coverage. Just two hot spots.

This is the trade off.


Regards,
Tom Barr