KGB:
When I was talking 10k bulbs with you, I was referring to the 10K double ended bulbs which are actually 13k double ended bulbs made by Aqualine-Busche, the only mogul 250W bulb I've used is the Iwasaki which in my opinion, is a little too yellow , supplementing with actinics corrects this.
How high is your friends tank?, my expierence is you could do either & be fine, if the tank is 24" high I would go 250 or a single 400W, if your friend gets bitten like the rest of us in this hobby, he'll soon want a larger tank, probably better to go no less than 250 so he won't have to upgrade later on.
Just my opinion.
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