Metal halide-Penetration

[Doug]

I often wonder how we arrive at all the lighting conclusions. This is just my opinion of course.

150,s are not bright enough for anything but small tanks. However, the local store has one of the 150 HQI units over a 180. Its a 3 banger & I can tell you its brighter to my eye, than my T-5,s, brighter then my 400w radiums on pulse starts & certainly brighter than my 12K 250w on a normal ballast. They are 10K by the way.

So, like some say, are my eyes decieving me? Mark, why dont you think the 10K is enough penatration? Is it a lot dimmer towards the bottom?

By the way, I have read all the par values on these bulbs and see the smaller readings for the 150,s but.........

I think Jim, has enough light for his aquarium. We have a 16in. deep tank at the store with a 150 HQI high overhead and it still looks good at the bottom.