BRE (Building Research Establishment) [ Paul Stearman
] [ 10-Nov-08 3:24pm ]The new BRE Visitor Centre / Innovation Park based at Watford is now open. The Park features a number of demonstration properties showcasing Modern Methods of Construction (MMC), near zero-carbon homes, and over 200 different innovative and emerging technologies. Further details can be found by visiting the BRE Web Site.
The Visitor Centre itself is entirely lit with Greenled LED Lamps using less than 300w of electricity to light the entire centre.
Paul C Stearman
Green Led Ltd
The Visitor Centre itself is entirely lit with Greenled LED Lamps using less than 300w of electricity to light the entire centre.
Paul C Stearman
Green Led Ltd
From your company website [ Herwig Delvaux ] [ 10-Nov-08 4:38pm ]Comparisons
Lamp Equivalents ......... Halogens ................... CFLs ................... LEDs
Light Efficiency ............. 25 lumens / watt ........ 50 lumens / watt ... 40 lumens / watt ???
Energy Efficiency .......... 10% ......................... 40% ..................... 90% ???
Where is the logic ??? Can you explain ?? The 2 numbers for LED show a contradiction when compared to CFL.
What exactly is measured within this Light Efficiency data provision?
Remember there is one standard mentioning lumens per watt of light output and another mentioning lumens per watt of electrical input, wich are 2 completely different things, but readily mixed up in all kind of datasheets.
Greets
Herwig
Lamp Equivalents ......... Halogens ................... CFLs ................... LEDs
Light Efficiency ............. 25 lumens / watt ........ 50 lumens / watt ... 40 lumens / watt ???
Energy Efficiency .......... 10% ......................... 40% ..................... 90% ???
Where is the logic ??? Can you explain ?? The 2 numbers for LED show a contradiction when compared to CFL.
What exactly is measured within this Light Efficiency data provision?
Remember there is one standard mentioning lumens per watt of light output and another mentioning lumens per watt of electrical input, wich are 2 completely different things, but readily mixed up in all kind of datasheets.
Greets
Herwig
Light Efficiency [ Paul Stearman ] [ 11-Nov-08 10:12am ]There are two issues to consider here one is the amount of light or lumens being emitted from the lamp per watt of electricity used. This is the Lumens per Watt ratio.
35w Halogen GU10 Lamp
174 Lumens = 5 Lumens per Watt
9w CFL GU10
270 Lumens = 30 Lumens per Watt
4w Greenled Antares GU10
184 Lumens = 46 Lumens per Watt
The Greenled Antares GU10 is clearly the most efficient lamp and with a Lamp Life of 50,000 hours or 7 Years in a Commercial Application. It will last 25 times as long as a Halogen and 5 Times as long as a CFL.
The energy efficiency comparison states how much of the wattage (power) is converted to light output. Halogen / Filament Lamps are effective heat sources as only 10% of the power used is given off as light. The comparison is a measure to show how effective the various sources are at producing light for a given wattage.
For example, if 35W was used with a Halogen lamp, a CFL Lamp and an LED Lamp, you would only have 10% of that 35W of power converted to light in the Halogen, 40% converted to light in the CFL but 90% in the LED unit.
Paul C Stearman
Green Led Ltd
174 Lumens = 5 Lumens per Watt
270 Lumens = 30 Lumens per Watt
184 Lumens = 46 Lumens per Watt
The Greenled Antares GU10 is clearly the most efficient lamp and with a Lamp Life of 50,000 hours or 7 Years in a Commercial Application. It will last 25 times as long as a Halogen and 5 Times as long as a CFL.
The energy efficiency comparison states how much of the wattage (power) is converted to light output. Halogen / Filament Lamps are effective heat sources as only 10% of the power used is given off as light. The comparison is a measure to show how effective the various sources are at producing light for a given wattage.
For example, if 35W was used with a Halogen lamp, a CFL Lamp and an LED Lamp, you would only have 10% of that 35W of power converted to light in the Halogen, 40% converted to light in the CFL but 90% in the LED unit.
Paul C Stearman
Green Led Ltd
Back to what I posted [ Herwig Delvaux ] [ 11-Nov-08 10:59am ]Yes, Paul
I aggree with the last line of comparison of the website's comparison datasheet,
Energy Efficiency .......... 10% ......................... 40% ..................... 90%
But I don't aggree with the second line !
Light Efficiency ............. 25 lumens / watt ........ 50 lumens / watt ... 40 lumens / watt
THAT is what I was talking about.
Now YOU are just giving THIS comparison:
Light Efficiency ............. 5 lumens / watt ........ 30 lumens / watt ... 46 lumens / watt
(lumens per watt of electrical input)
If this is correct,
I think that your website's information must be adopted immediately... don't you think so ??
Greets
Herwig
I aggree with the last line of comparison of the website's comparison datasheet,
Energy Efficiency .......... 10% ......................... 40% ..................... 90%
But I don't aggree with the second line !
Light Efficiency ............. 25 lumens / watt ........ 50 lumens / watt ... 40 lumens / watt
THAT is what I was talking about.
Now YOU are just giving THIS comparison:
Light Efficiency ............. 5 lumens / watt ........ 30 lumens / watt ... 46 lumens / watt
(lumens per watt of electrical input)
If this is correct,
I think that your website's information must be adopted immediately... don't you think so ??
Greets
Herwig
Light Efficiency [ Paul Stearman ] [ 11-Nov-08 2:00pm ]I hope I am not appearing to be defensive on the issue of Light Efficiency and hope that the following explains the calculations.
A Mains Voltage 35w GU10 Lamp manufactured by Osram emits 174 Lumens. Therefore 174 / 35 = 4.97 or 5 Lumens per Watt of electricity used.
A 9w GU10 CFL Lamp manufactured by Megaman emits 278 lumens. Therefore 278 / 9 = 30.88 or 31 Lumens per Watt of Electricity used.
A 4w GU10 Antares Lamp manufactured by Greenled emits 184 lumens. Therefore 184 / 4 = 46 Lumens per Watt of Electricity used.
I agree that the Light Efficiency section of the Greenled Comparison Chart on the Web Site needs to be amended.
The above calculations in fact highlight that where possible; one should use Greenled LED Lamps. The obvious argument has to be the initial cost of the lamp and possible installation cost. However, in our experience, changing over from a Halogen GU10 to Greenled GU10 LED Lamps will save £15.00 in year one and over 3 years save £97.00 Per Lamp.
A "Payback Period" for the Greenled lamp is about 9 months.
Paul C Stearman
Green Led Ltd
I agree that the Light Efficiency section of the Greenled Comparison Chart on the Web Site needs to be amended.
The above calculations in fact highlight that where possible; one should use Greenled LED Lamps. The obvious argument has to be the initial cost of the lamp and possible installation cost. However, in our experience, changing over from a Halogen GU10 to Greenled GU10 LED Lamps will save £15.00 in year one and over 3 years save £97.00 Per Lamp.
A "Payback Period" for the Greenled lamp is about 9 months.
Paul C Stearman
Green Led Ltd
:) [ Herwig Delvaux ] [ 11-Nov-08 2:25pm ]No, to the contrary.
I aggree with your own presentation...
But I guess, the Greenled Comparison Chart has mixed up the different measuring categories.
One remark about using Halogen in ZERO Energy houses, however...
The 95% heat from halogen (some are better... => 90%
) is usefull in wintertime heat supply in a Zero-Energy house.
The Zero Energy concept allmost allways holds a smaller ELECTRICAL (!!!) heating device build into the ventillation system to compensate for the minimal heat loss there anyway still is. All electrical devices used in the household, however, deliver additional heat. As such, the heat NOT regained from the lightbulbs, in case of LED, must be provided by the separate heating device.
Total energy concept planning, can be tricky ! LOL
Greets
Herwig
I aggree with your own presentation...
But I guess, the Greenled Comparison Chart has mixed up the different measuring categories.
One remark about using Halogen in ZERO Energy houses, however...
The 95% heat from halogen (some are better... => 90%
) is usefull in wintertime heat supply in a Zero-Energy house. The Zero Energy concept allmost allways holds a smaller ELECTRICAL (!!!) heating device build into the ventillation system to compensate for the minimal heat loss there anyway still is. All electrical devices used in the household, however, deliver additional heat. As such, the heat NOT regained from the lightbulbs, in case of LED, must be provided by the separate heating device.
Total energy concept planning, can be tricky ! LOL
Greets
Herwig
I've seen a few press releases for the BRE Visitor Centre [ John Cave
] [ 11-Nov-08 7:09pm ]and would definately like to go.
Anyone else fancy coming? I'm happy to co-ordinate and arrange a guided tour.
Independent Building Materials Advice and Supply
Anyone else fancy coming? I'm happy to co-ordinate and arrange a guided tour.
Independent Building Materials Advice and Supply
BRE (Building Research Establishment) [ Paul Stearman ] [ 12-Nov-08 8:26am ]Not only is the BRE visitor centre an interesting place to see the latest products / ideas regarding "Green Building", it also has facilities for meetings. A possible venue for an AEC get together.
Paul C Stearman
Green Led Ltd
Paul C Stearman
Green Led Ltd
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