T5 lighting ATI vs Giesemann
 

Nice little article .
http://aquanerd.com/2015/07/ati-gies...on-part-1.html

I personally run the Giesemann but that is what I started on but as the article stated the Giesemann T5s the names on the lights are deceiving as what was said was lagoon blue to me ended up being bright white lights and lights advertised as actinic blue to me were more towards to purple rather than blue but again I run a deep tank so the lights give different colours in deeper tanks

I am considering the ATI's as the colours seem to be more true to the names listed so I have some decisions to make before I replace in August

Good article though