double ended mh bulbs vs screw in type

[robzilla]

[quote="Samw"]Enough for what?

I'm pretty sure the 250W would be better. If you use a DO meter to test photosynthesis (oxygen output), I'm almost sure that you would have higher DO with the 250W bulb. In other words, the extra light is not being wasted and is being used for additional photosynthesis. That's the case in my tank anyways which is full of photosynthetic animals.

And it goes without saying that all this depends on what you want to keep. If you aren't keeping anything very light demanding, then the 175W is probably enough.



thanks for the input, but i'm still puzzled as to which way to go, with the se or de for a pendant light setup. j&l recommend a de but indicated they didn't carry many bulbs for them. will getting new bulbs be an issue for the de?
thoughts on remote ballast vs Built in ventilated ballast
thanks
rob