here it is

[reefburnaby]

Hi,

Typically (not all lamps and ballasts are the same...but usually for 5500K),

175W MH draws 2 amps and produces 12000 lumens (8000 lumens over 1000 hours).

250W MH draws 3 amps and produces 20000 lumens (13000 lumens over 1000 hours).

400W MH draws 4 amps and produces 33000 lumens (22000 lumens over 1000 hours).

So...you get about 60% more light with 250W over a 175W.

As for the 5500 lumen part...I think you refering to the colour of the lamps -- 5500 Kelvin. Higher Kelvin lamps have a higher proportion of blue light over red light.

- Victor.

[reefburnaby]

Hi,

In general, higher lumens (from a MH) usually allows one to light up a deeper tank. If you are supply 200W to a 400W blub...then you will produce approximately 50% less lumens. By using two lamps fixtures...it does not necessarily mean you will double the light intensity of a given area -- but you will be pretty close.

Hope that helps.

- Victor.

[BCReefer]

I knew I should have just said 5500 K bulb.

So if more wattage means more lumens which I presume can mean a deeper tank, then if one purchases a 400W ballast, be it a MH or a VHO, and the out put wattage is only 50 – 60 %, then you might not reach the bottom of the tank where the light is needed? So then you would be required to purchase 2 sets or do something totally different?

That is 1 heck of a long sentence.

I hope I am understanding this properly?? If not then I will save it for our next meeting and hopefully someone can explain it to me.

[Mushroom Boy]

Not at all BCReefer, I tend to think you're right. [img]images/smiles/icon_smile.gif[/img]

[canadawest]

<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Originally posted by BCReefer:

I hope I am understanding this properly?? If not then I will save it for our next meeting and hopefully someone can explain it to me.<HR></BLOCKQUOTE>

Speaking of "next meeting", has anyone steped up to the plate and prepared for an afternoon of visitors?

I know it's a busy time of year, but perhaps we could squeeze a meeting in the weekend of Dec 22/23?? Just a thought. If anyone is willing, now would be a good time to set it up.

PS.. I will likely have a couple heads of Torch coral and maybe some Acropora if someone could help me frag it. (ahem, Jamie or Darren, ahem)

[ 08 December 2001: Message edited by: canadawest ]

[Acro]

Andrew,
Man that must be a big piece if ya need helpj/k Sure lets hook up next week seeing we work for the same place right now I'm sure I can step out of the office for a bit what works best for you?
Later Jamie

[canadawest]

Well let me check my schedule with my personal assistant, and then I'll have her contact your personal assistant to setup a time that works for both of us.

I have mentioned to her that I have a wide open schedule all this week. Perhaps your assistant can find a time that works for you?

PS.. It's not very big, it's just that I've never frag'd an Acro before. (And could you bring some putty?) If we can get two or more decent frags from it, you're welcome to one for your trouble.