Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > Dockside Chat
Reload this Page >

Am I missing something? LED light power cost math...

Notices

Am I missing something? LED light power cost math...

Old 11-16-2015, 06:53 PM
  #1  
Admirals ClubCaptains Club Member Admiral's Club Member
Thread Starter
 
Join Date: Oct 2007
Posts: 7,114
Default Am I missing something? LED light power cost math...

I'm looking into getting one of
these these
to light up my swimming pool and backyard...

Now, it supposed to be 240W and the average cost per kWh in my area (Broward county, FL) is 11.6 cents..

240 W /1000 = 0.24 kW

1 hour usage at 0.24 kW = 0.24kWh

0.24kWh at 11.6cents = 2.784 cents

Am I right?
I know that the actual output is not going to look like the illuminated fields they show in the pictures, but it will be more than enough for my application... I'm not complaining but not even $0,03 per hour seems too low for all that light..

Where did I mess up?
emudryj is offline  
Old 11-16-2015, 07:43 PM
  #2  
Senior Member
 
Join Date: Feb 2012
Posts: 766
Default

Your math is correct. If light was on 24/7 cost will be about $20 per month. Use it for time you need it then it is cheap. Do these calcs all the time in my field of work.

X factor is your family who will leave it on 24/7. HAHA!
madhatter1 is online now  
Old 11-16-2015, 08:09 PM
  #3  
Admirals ClubCaptains Club Member Admiral's Club Member
Thread Starter
 
Join Date: Oct 2007
Posts: 7,114
Default

Originally Posted by madhatter1 View Post
Your math is correct. If light was on 24/7 cost will be about $20 per month. Use it for time you need it then it is cheap. Do these calcs all the time in my field of work.

X factor is your family who will leave it on 24/7. HAHA!
Trust me... I feel like my dad yelling to turn off the lights when not in use!!!!

the very last thing I did before seating to check this post was to go around the house turning lights off...

That little flood light seems to be really powerful, I really do not have anything to compare it to, but I imagine that it will be hard to forget that one on...
$300 bucks is not cheap but I'll buy one and see how much do they really put out... at least the reviews are good.
emudryj is offline  
Old 11-17-2015, 05:47 AM
  #4  
Admirals Club Admiral's Club Member
 
Join Date: May 2008
Location:
Posts: 3,523
Default

Bought Cree Floodlights had 2 fail within 6 months :-( !!!
Tommysmicroskiff is offline  
Old 11-17-2015, 08:51 AM
  #5  
Senior Member
 
Join Date: Dec 2012
Location: melbourne, fl
Posts: 321
Default

I have a few of the 30w versions for work lights and they is bright as hell. I will say one is a strobe now? They get used and abused by my guys - practically submerged in water...
strange is offline  
Old 11-17-2015, 09:21 AM
  #6  
Admirals ClubCaptains Club Member Admiral's Club Member
Thread Starter
 
Join Date: Oct 2007
Posts: 7,114
Default

Originally Posted by strange View Post
I have a few of the 30w versions for work lights and they is bright as hell. I will say one is a strobe now? They get used and abused by my guys - practically submerged in water...
what brand?
I was going with this one mainly because of the positive reviews on Amazon
emudryj is offline  
Old 11-17-2015, 11:04 AM
  #7  
Senior Member
 
Join Date: May 2014
Location: Wendell, NC
Posts: 2,199
Default

Originally Posted by Tommysmicroskiff View Post
Bought Cree Floodlights had 2 fail within 6 months :-( !!!
CREE used to be an employer of choice round these parts, for both engineering and manufacturing. Not anymore. I'm not surprised your lights failed.
NCSUboater is offline  
Old 11-17-2015, 12:17 PM
  #8  
THT SponsorCaptains Club Member
THT sponsor
 
Join Date: Mar 2007
Location: Wisconsin And Marathon,Fl
Posts: 8,498
Default

I think your math is correct also, but consider what you would pay to run the equivalent 600W High Pressure Sodium bulb.
mikeloew is offline  
Old 11-17-2015, 02:13 PM
  #9  
Admirals ClubCaptains Club Member Admiral's Club Member
Thread Starter
 
Join Date: Oct 2007
Posts: 7,114
Default

Originally Posted by mikeloew View Post
I think your math is correct also, but consider what you would pay to run the equivalent 600W High Pressure Sodium bulb.
I have no experience with HPS bulbs but, by pure math I would assume that almost triple right?
600/1000=0.6kWh * 11.6cents = 6.96 cents per hour...

well... little over double.... I just hope the life expectancy is better with LED are better than HPS bulbs...

I already ordered so I hesitate to look now, but I wonder how much would it cost the same fixture in HPS compared to the $300 I paid for this one on LED..

I think I'm starting to regret it....
emudryj is offline  
Old 11-17-2015, 03:10 PM
  #10  
THT SponsorCaptains Club Member
THT sponsor
 
Join Date: Mar 2007
Location: Wisconsin And Marathon,Fl
Posts: 8,498
Default

Originally Posted by emudryj View Post
I have no experience with HPS bulbs but, by pure math I would assume that almost triple right?
600/1000=0.6kWh * 11.6cents = 6.96 cents per hour...

well... little over double.... I just hope the life expectancy is better with LED are better than HPS bulbs...

I already ordered so I hesitate to look now, but I wonder how much would it cost the same fixture in HPS compared to the $300 I paid for this one on LED..

I think I'm starting to regret it....
I can't see why you think your wrong, if you really need the light a 600w HPS bulb would give and you can do it at a savings of over 60%. I do understand your LED longevity dilemma. If the light you are buying is as reliable as any of the LEDs I have used so far it will last a long long time. Good luck.
mikeloew is offline  
Old 11-17-2015, 05:14 PM
  #11  
Senior Member
 
Join Date: Feb 2012
Posts: 766
Default

Think of the low watt bulbs as low HP engines, they will run forever even if abused.
The high watt bulbs are a like high HP engines. Performance yes but at a price.
At least where we are today but tomorrow comes real fast at this point.

I am changing out only high use fixtures for now. The rest will come when cheaper and more reliable. Maybe tomorrow or next Tuesday but not far off.

Now gotta research some good dimmers!
madhatter1 is online now  
Old 11-17-2015, 05:26 PM
  #12  
Senior Member
 
Hagar TH's Avatar
 
Join Date: Mar 2013
Location: Central Fl
Posts: 4,421
Default

Wife was an LED field specialist with Philips for 9 years. In the program from the beginning and she replaced every single lamp in or 2500 sq ft home with LED's Bulbs, tubes, all of them. Our power bill dropped on average about 36.00 per month. Todays LED's are so good (if you don't buy the cheap crap from Walmart) you can put them in your will.
Hagar TH is offline  
Old 11-17-2015, 09:47 PM
  #13  
Senior Member
 
Join Date: Dec 2012
Location: melbourne, fl
Posts: 321
Default

Originally Posted by emudryj View Post
what brand?
I was going with this one mainly because of the positive reviews on Amazon
Not sure, but they look exactly like the one in your link.
Bought them from amazon.
strange is offline  
Old 11-18-2015, 04:17 AM
  #14  
Senior Member
 
Join Date: Mar 2011
Location: St. Pete
Posts: 1,217
Default

I have a couple of the 50w versions of that style from amazon. They have been outside lighting up an exterior of a building. They are are the $30 models and are very bright. The housings are getting a little rusty in some areas but are still working. I would imagine the one you listed would practically light up a stadium .
This is what I have. They are even cheaper now. There are a bunch more options than the last time I looked.
http://www.amazon.com/gp/aw/d/B007CEVJKW/ref=mp_s_a_1_3?qid=1447849101&sr=8-3&pi=SY200_QL40&keywords=50w+led+flood+light&dpPl= 1&dpID=41wZihTciHL&ref=plSrch
04keywest1720 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread