LED Wattage Savings

Nanook · 03/01/2011, 11:10 AM

Hypothetical at this point. I have a tank that is 8ft x 30" x 30" that currently is lit nicely by 4 250 watt metal halides. So, this is 1000 watts total. How much wattage would it cost to light with 3 watt Cree LED's?

Thanks.

nanojg · 03/01/2011, 11:16 AM

I think you would need around 200 LEDs, run them at 2 watts each (which is typical) and you will save about 600 watts.

hvacman250 · 03/01/2011, 11:53 AM

I would replace each 250W MH with a cluster of 48 Crees, so 192 LEDs in total.

Hypothetically, run them at full wattage, so 192x3=576 Watts.

576 x 8 (hrs per day) x 365 (days per year) = 1,681,920 Watt Hours (1681.92 KWH)

1681.92 x $0.12 per kW (insert your rate here) = $201.83 for LEDs
Running them at 2 W each = $134.55

Same math for 1000 W MHs= $350.40/year

Savings of $148.57 per year, or $12.38 per month @ 3W or $215.85 , or $17.988 per month @ 2W

Also, dont forget to factor in your bulb savings per year since LEDs are projected to last 10 years, and heat savings since LEDs are MUCH cooler than MHs.

Anemonebuff · 03/01/2011, 03:44 PM

I changed from 605 watts of MH to 125 watts of LED in November and my electric bill came up $184 short for the year on my balanced budget. Now that is only about 3 months of use. It should go down even more next year. For now I will save $30 a month over the next billing year. It will probably save me $50-60 a month the year after. I am also in the process of replacing my household bulbs(mostly 13 or 18 watt CFLs and a few 60 watt incandescents) with 8 watt LED bulbs. Hopefully this will make a big impact as well.

03/01/2011, 11:10 AM	#1
Nanook Ancient Eskimo Legend Join Date: Mar 2001 Location: Saint Louis, MO Posts: 41,852 Blog Entries: 11	LED Wattage Savings Hypothetical at this point. I have a tank that is 8ft x 30" x 30" that currently is lit nicely by 4 250 watt metal halides. So, this is 1000 watts total. How much wattage would it cost to light with 3 watt Cree LED's? Thanks. __________________ The wind blew, the chit flew, and then they came two by two. ~~~~~~~~~~~~~~ Current Tank Info: 375g Tanganyikan Tank & 470g mixed reef

03/01/2011, 11:53 AM	#3
hvacman250 Registered Member Join Date: Sep 2010 Posts: 733	I would replace each 250W MH with a cluster of 48 Crees, so 192 LEDs in total. Hypothetically, run them at full wattage, so 192x3=576 Watts. 576 x 8 (hrs per day) x 365 (days per year) = 1,681,920 Watt Hours (1681.92 KWH) 1681.92 x $0.12 per kW (insert your rate here) = $201.83 for LEDs Running them at 2 W each = $134.55 Same math for 1000 W MHs= $350.40/year Savings of $148.57 per year, or $12.38 per month @ 3W or $215.85 , or $17.988 per month @ 2W Also, dont forget to factor in your bulb savings per year since LEDs are projected to last 10 years, and heat savings since LEDs are MUCH cooler than MHs. __________________ 220 in-wall reef, 10 clown pairs, 4 fry tanks, 18 grow-out tanks Current Tank Info: 220 in-wall reef, clownfish breeding/growout system, 20L coral QT and 29 fish QT

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03/01/2011, 11:16 AM	#2
nanojg Registered Member Join Date: Jan 2009 Location: Lubbock, Texas Posts: 2,174	I think you would need around 200 LEDs, run them at 2 watts each (which is typical) and you will save about 600 watts.

03/01/2011, 03:44 PM	#4
Anemonebuff Registered Member Join Date: Feb 2001 Location: LI,NY Posts: 3,877	I changed from 605 watts of MH to 125 watts of LED in November and my electric bill came up $184 short for the year on my balanced budget. Now that is only about 3 months of use. It should go down even more next year. For now I will save $30 a month over the next billing year. It will probably save me $50-60 a month the year after. I am also in the process of replacing my household bulbs(mostly 13 or 18 watt CFLs and a few 60 watt incandescents) with 8 watt LED bulbs. Hopefully this will make a big impact as well.