Anyone good at math??

God of thunder · 10/02/2007, 12:12 PM

Hi.

IÂ´ve got 400w 10k MH and 14k 25w t5 along with 3x 25k t5.
Who can tell me what my total k volume is?

javajaws · 10/02/2007, 12:51 PM

There's no such thing as "k volume" (AFAIK).

What is it you really want to know (in english)?

God of thunder · 10/02/2007, 12:59 PM

IÂ´m talking about kelvins.
IÂ´ve got a 400 w 10000 kelvin bulp.
1 14000 kelvin 25 w (T5)
and 3 25000 kelvin 25w (T5)

the t5Â´s wont count as much as the 400w be cause combined they are only 100w. i hope this helps you help me.
IÂ´m icelandic so english is not my first language...sorry

javajaws · 10/02/2007, 01:18 PM

I'm sure somebody else can give a more technically correct answer than me, but...the k rating of a bulb is just describing (in general terms) the bulb's color temperature. This in itself doesn't really mean anything because it is usually a marketing number and not based on fact (Example: Iwasaki 50k bulbs). Yes, generally 20k bulbs will be bluer than 14k, etc. But you can't make any sort of calculations from them that really mean anything. I think the only way to calculate the actual and combined k value of those bulbs is to use some measuring equipment to do so.

javajaws · 10/02/2007, 01:20 PM

http://en.wikipedia.org/wiki/Color_temperature

God of thunder · 10/02/2007, 01:22 PM

Ok thanks alot, i was not looking for an exect number though, just a rough idea. My t5Â´s are from arcadia and my mH is a coralvue reeflux, i donÂ´t supose that helps in calculating a rough number? what would be you guess?

manderx · 10/02/2007, 01:22 PM

so you are trying to figure out what the overall K your tank is getting?

that's not a number you can figure. the K ratings you listed are purely in name only, they don't relate to any real world measurement. you'd have to have the measured spectrum from each bulb. and then even if you did, differences in reflectors and distances that affect how much of the light makes it into the tank and how it blends would still make it impossible. if you *really* want to know, you'd have to measure it. and measure it for many spots in the tank and average.

why does it matter though?

javajaws · 10/02/2007, 01:28 PM

If you're more worried about growth...then you should really be asking about PAR.

God of thunder · 10/02/2007, 01:29 PM

Well, iÂ´m leaning toward a slightly bluer light, iÂ´d like to get some idea of what to aim for....

javajaws · 10/02/2007, 01:35 PM

Well...

((400 x 10000) + (25 x 14000) + (3 x 25 x 25000) )/ 500 (total watts) = 12450 k avg

This perhaps might give you an estimate of what color to expect...

God of thunder · 10/02/2007, 02:34 PM

Wow, too bad i didnÂ´t do so good in math i school

javajaws · 10/02/2007, 02:40 PM

I didn't even have to break out Mathematica for that one!

10/02/2007, 12:12 PM	#1
God of thunder Registered Member Join Date: Aug 2007 Location: Iceland Posts: 627	Anyone good at math?? Hi. IÂ´ve got 400w 10k MH and 14k 25w t5 along with 3x 25k t5. Who can tell me what my total k volume is? __________________ Not guts, no glory! Current Tank Info: 95 Gal Eheim MP, 400W coralvue reeflux 10k 4x25W T5 25k

10/02/2007, 12:51 PM	#2
javajaws Premium Member Join Date: Feb 2004 Location: Round Rock, TX Posts: 1,620	There's no such thing as "k volume" (AFAIK). What is it you really want to know (in english)? __________________ Everyone has an opinion. Accept the fact now that someone isn't going to like yours sooner or later. Current Tank Info: 110g in-wall, ATI 8x54w T5, 2xMP40es, SRO XP-2000i, 2-part Ca/Alk, Apex controlled

10/02/2007, 12:59 PM	#3
God of thunder Registered Member Join Date: Aug 2007 Location: Iceland Posts: 627	IÂ´m talking about kelvins. IÂ´ve got a 400 w 10000 kelvin bulp. 1 14000 kelvin 25 w (T5) and 3 25000 kelvin 25w (T5) the t5Â´s wont count as much as the 400w be cause combined they are only 100w. i hope this helps you help me. IÂ´m icelandic so english is not my first language...sorry __________________ Not guts, no glory! Current Tank Info: 95 Gal Eheim MP, 400W coralvue reeflux 10k 4x25W T5 25k

10/02/2007, 01:18 PM	#4
javajaws Premium Member Join Date: Feb 2004 Location: Round Rock, TX Posts: 1,620	I'm sure somebody else can give a more technically correct answer than me, but...the k rating of a bulb is just describing (in general terms) the bulb's color temperature. This in itself doesn't really mean anything because it is usually a marketing number and not based on fact (Example: Iwasaki 50k bulbs). Yes, generally 20k bulbs will be bluer than 14k, etc. But you can't make any sort of calculations from them that really mean anything. I think the only way to calculate the actual and combined k value of those bulbs is to use some measuring equipment to do so. __________________ Everyone has an opinion. Accept the fact now that someone isn't going to like yours sooner or later. Current Tank Info: 110g in-wall, ATI 8x54w T5, 2xMP40es, SRO XP-2000i, 2-part Ca/Alk, Apex controlled

10/02/2007, 01:20 PM	#5
javajaws Premium Member Join Date: Feb 2004 Location: Round Rock, TX Posts: 1,620	http://en.wikipedia.org/wiki/Color_temperature __________________ Everyone has an opinion. Accept the fact now that someone isn't going to like yours sooner or later. Current Tank Info: 110g in-wall, ATI 8x54w T5, 2xMP40es, SRO XP-2000i, 2-part Ca/Alk, Apex controlled

10/02/2007, 01:22 PM	#6
God of thunder Registered Member Join Date: Aug 2007 Location: Iceland Posts: 627	Ok thanks alot, i was not looking for an exect number though, just a rough idea. My t5Â´s are from arcadia and my mH is a coralvue reeflux, i donÂ´t supose that helps in calculating a rough number? what would be you guess? __________________ Not guts, no glory! Current Tank Info: 95 Gal Eheim MP, 400W coralvue reeflux 10k 4x25W T5 25k

10/02/2007, 01:22 PM	#7
manderx Registered Member Join Date: Mar 2002 Location: Christiansburg, VA Posts: 4,893	so you are trying to figure out what the overall K your tank is getting? that's not a number you can figure. the K ratings you listed are purely in name only, they don't relate to any real world measurement. you'd have to have the measured spectrum from each bulb. and then even if you did, differences in reflectors and distances that affect how much of the light makes it into the tank and how it blends would still make it impossible. if you really want to know, you'd have to measure it. and measure it for many spots in the tank and average. why does it matter though?

10/02/2007, 01:28 PM	#8
javajaws Premium Member Join Date: Feb 2004 Location: Round Rock, TX Posts: 1,620	If you're more worried about growth...then you should really be asking about PAR. __________________ Everyone has an opinion. Accept the fact now that someone isn't going to like yours sooner or later. Current Tank Info: 110g in-wall, ATI 8x54w T5, 2xMP40es, SRO XP-2000i, 2-part Ca/Alk, Apex controlled

10/02/2007, 01:29 PM	#9
God of thunder Registered Member Join Date: Aug 2007 Location: Iceland Posts: 627	Well, iÂ´m leaning toward a slightly bluer light, iÂ´d like to get some idea of what to aim for.... __________________ Not guts, no glory! Current Tank Info: 95 Gal Eheim MP, 400W coralvue reeflux 10k 4x25W T5 25k

10/02/2007, 01:35 PM	#10
javajaws Premium Member Join Date: Feb 2004 Location: Round Rock, TX Posts: 1,620	Well... ((400 x 10000) + (25 x 14000) + (3 x 25 x 25000) )/ 500 (total watts) = 12450 k avg This perhaps might give you an estimate of what color to expect... __________________ Everyone has an opinion. Accept the fact now that someone isn't going to like yours sooner or later. Current Tank Info: 110g in-wall, ATI 8x54w T5, 2xMP40es, SRO XP-2000i, 2-part Ca/Alk, Apex controlled

10/02/2007, 02:34 PM	#11
God of thunder Registered Member Join Date: Aug 2007 Location: Iceland Posts: 627	Wow, too bad i didnÂ´t do so good in math i school __________________ Not guts, no glory! Current Tank Info: 95 Gal Eheim MP, 400W coralvue reeflux 10k 4x25W T5 25k

10/02/2007, 02:40 PM	#12
javajaws Premium Member Join Date: Feb 2004 Location: Round Rock, TX Posts: 1,620	I didn't even have to break out Mathematica for that one! __________________ Everyone has an opinion. Accept the fact now that someone isn't going to like yours sooner or later. Current Tank Info: 110g in-wall, ATI 8x54w T5, 2xMP40es, SRO XP-2000i, 2-part Ca/Alk, Apex controlled