How much more heat if you go from 175W to 250W

Hello!

I am thinking about going from 175W MH's to 250W MH's so I can run the
Iwasaki 6500k's.

My concern is the increase in heat. I understand that there is some formula
that converts a watt to a BTU, but is it safe to assume there is a linear
relationship for heat? IOW...the 250W has 43% more watts than a 175W.
Should I assume that they will put out 43% more heat? If my temperature
increases by 6 degree's during my photoperiod, should I plan for 8.58
degree's (6 x 1.43)?

Does anyone have suggestions on ballasts? I read Sanjay's paper on ballasts
and it appears that any magnetic (tar, core & coil, etc) ballast is the best
for PPFD and output for the 250W Iwasaki. Anyone know of any updates or new
info since this was published?

Also, if you are interested in purchasing or trading, I have (6 month old) a
175W double CSL ballast and a single.

Thanks!
LarryT

I am thinking about going from 175W MH's to 250W MH's so I can run the
Iwasaki 6500k's.

My concern is the increase in heat. I understand that there is some
formula
that converts a watt to a BTU, but is it safe to assume there is a
linear
relationship for heat? IOW...the 250W has 43% more watts than a 175W.
Should I assume that they will put out 43% more heat? If my temperature
increases by 6 degree's during my photoperiod, should I plan for 8.58
degree's (6 x 1.43)?

The lights will really put out about 43% more heat. However,
temperature calculations are a bit more complex. If you're worried about
temperatures, spend $50 on an HVAC temperature controller and $30 on some
good, quiet fans.

steve

Thanks!

I have 2 IceCap fans in the hood and 1 blowing on the water in the sump.
The hood air volume gets turned over 5+ times per minute. I guess I could
add another if needed.

LT

"Steve Wolfe" wrote in message
...
I am thinking about going from 175W MH's to 250W MH's so I can run the
Iwasaki 6500k's.

My concern is the increase in heat. I understand that there is some
formula
that converts a watt to a BTU, but is it safe to assume there is a
linear
relationship for heat? IOW...the 250W has 43% more watts than a 175W.
Should I assume that they will put out 43% more heat? If my temperature
increases by 6 degree's during my photoperiod, should I plan for 8.58
degree's (6 x 1.43)?

The lights will really put out about 43% more heat. However,
temperature calculations are a bit more complex. If you're worried about
temperatures, spend $50 on an HVAC temperature controller and $30 on some
good, quiet fans.

steve

i'd be worried most about the 6 deg temp swing you have now, IMO thats to
much of a swing in a 24 hr period. are you running the fan's when lights
are off? doing this will give a greater swing in temp, not doing it gives a
higher tank avg temp.


kc

"ljtellef" wrote in message
...
Hello!

I am thinking about going from 175W MH's to 250W MH's so I can run the
Iwasaki 6500k's.

My concern is the increase in heat. I understand that there is some
formula
that converts a watt to a BTU, but is it safe to assume there is a linear
relationship for heat? IOW...the 250W has 43% more watts than a 175W.
Should I assume that they will put out 43% more heat? If my temperature
increases by 6 degree's during my photoperiod, should I plan for 8.58
degree's (6 x 1.43)?

Does anyone have suggestions on ballasts? I read Sanjay's paper on
ballasts
and it appears that any magnetic (tar, core & coil, etc) ballast is the
best
for PPFD and output for the 250W Iwasaki. Anyone know of any updates or
new
info since this was published?

Also, if you are interested in purchasing or trading, I have (6 month old)
a
175W double CSL ballast and a single.

Thanks!
LarryT

2 IceCap fans that run 24/7.

I've been running with this temp swing for 2+ years w/o a problem, but
turning the fans off is something to consider. Don't shallow reefs have a
swing of 10-15 degree's?

Thanks!
LT

"Dragon Slayer" wrote in message
...
i'd be worried most about the 6 deg temp swing you have now, IMO thats to
much of a swing in a 24 hr period. are you running the fan's when lights
are off? doing this will give a greater swing in temp, not doing it gives
a
higher tank avg temp.


kc

"ljtellef" wrote in message
...
Hello!

I am thinking about going from 175W MH's to 250W MH's so I can run the
Iwasaki 6500k's.

My concern is the increase in heat. I understand that there is some
formula
that converts a watt to a BTU, but is it safe to assume there is a
linear
relationship for heat? IOW...the 250W has 43% more watts than a 175W.
Should I assume that they will put out 43% more heat? If my temperature
increases by 6 degree's during my photoperiod, should I plan for 8.58
degree's (6 x 1.43)?

Does anyone have suggestions on ballasts? I read Sanjay's paper on
ballasts
and it appears that any magnetic (tar, core & coil, etc) ballast is the
best
for PPFD and output for the 250W Iwasaki. Anyone know of any updates or
new
info since this was published?

Also, if you are interested in purchasing or trading, I have (6 month
old)
a
175W double CSL ballast and a single.

Thanks!
LarryT

I have no idea about shallow reef's but IME having a stable tank
(temp/ph/alk/etc....) is more healthy then one with constant changes.

ymmv
kc

"ljtellef" wrote in message
...
2 IceCap fans that run 24/7.

I've been running with this temp swing for 2+ years w/o a problem, but
turning the fans off is something to consider. Don't shallow reefs have a
swing of 10-15 degree's?

Thanks!
LT

"Dragon Slayer" wrote in message
...
i'd be worried most about the 6 deg temp swing you have now, IMO thats
to
much of a swing in a 24 hr period. are you running the fan's when
lights
are off? doing this will give a greater swing in temp, not doing it
gives
a
higher tank avg temp.


kc

"ljtellef" wrote in message
...
Hello!

I am thinking about going from 175W MH's to 250W MH's so I can run the
Iwasaki 6500k's.

My concern is the increase in heat. I understand that there is some
formula
that converts a watt to a BTU, but is it safe to assume there is a
linear
relationship for heat? IOW...the 250W has 43% more watts than a 175W.
Should I assume that they will put out 43% more heat? If my
temperature
increases by 6 degree's during my photoperiod, should I plan for 8.58
degree's (6 x 1.43)?

Does anyone have suggestions on ballasts? I read Sanjay's paper on
ballasts
and it appears that any magnetic (tar, core & coil, etc) ballast is
the
best
for PPFD and output for the 250W Iwasaki. Anyone know of any updates
or
new
info since this was published?

Also, if you are interested in purchasing or trading, I have (6 month
old)
a
175W double CSL ballast and a single.

Thanks!
LarryT

The lights will really put out about 43% more heat. However,
temperature calculations are a bit more complex. If you're worried about
temperatures, spend $50 on an HVAC temperature controller and $30 on some
good, quiet fans.

steve





For what it's worth, (I work for an HVAC wholesaler) the formula is approx.
3.413 BTU per watt and I could same you some money on a good temperature
controller.

~Mort