Browse Forums Eco Living Re: LED lighting 21Aug 03, 2009 12:54 am An interesting graph on luminous efficiency of various lighting systems: http://4.bp.blogspot.com/_3iqp6erxj3s/S ... r+watt.jpg Re: LED lighting 22Aug 19, 2009 5:49 pm LED systems are natural choice for their efficient power consumption, durable construction and distinctive white light. As LED technology has advanced, the LED light market has exploded and there are many systems available today. Regards, Dabria Re: LED lighting 23Aug 20, 2009 12:58 am Dabria LED systems are natural choice for their efficient power consumption, durable construction and distinctive white light. As LED technology has advanced, the LED light market has exploded and there are many systems available today. Regards, Dabria Most commercial sites compare LED vs standard light bulbs. Rarely do they compare LED with CFLs and fluoro tubes. If you do this then the advantages aren't that signficant. There is not much to be gained from switching from CFLS and fluorescent tubes to LED for your general lighting at this stage. - LED (maybe last 50% longer) - LED Energy efficiency (similar to CFLS, worse than fluoro tubes) - LED cost (10x of CFLs)! The argument isn't that compelling (apart from perhaps the mercury disposal issue with fluorescent lights and the ability to tolerate being switched on and off frequently). New CFLS are also dimmable. Current verdict - LEDs are an eco-gimmick for your desk lamp. Re: LED lighting 24Aug 20, 2009 12:56 pm dymonite69 Dabria LED systems are natural choice for their efficient power consumption, durable construction and distinctive white light. As LED technology has advanced, the LED light market has exploded and there are many systems available today. Regards, Dabria http://www.lyco.co.uk/Light-Bulbs/Decor ... c1358.aspx Most commercial sites compare LED vs standard light bulbs. Rarely do they compare LED with CFLs and fluoro tubes. If you do this then the advantages aren't that signficant. There is not much to be gained from switching from CFLS and fluorescent tubes to LED for your general lighting at this stage. - LED (maybe last 50% longer) - LED Energy efficiency (similar to CFLS, worse than fluoro tubes) - LED cost (10x of CFLs)! The argument isn't that compelling (apart from perhaps the mercury disposal issue with fluorescent lights and the ability to tolerate being switched on and off frequently). New CFLS are also dimmable. Current verdict - LEDs are an eco-gimmick for your desk lamp. Other advantages of LEDs are instant full brightness, tolerance to being switched on and off frequently and, from my understanding they last 500% longer than flourescents. On this last itme, most of your lights will never have to be repalced - they'll tear the building down to build a new one before you replace the majority of the lights. Oh, and LEDs are dimmable as a norm, rather than an exception. Yes, LEDs are much more expensive today. But they will get much cheaper (and last even longer). Unfortunately this is still many years away. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: LED lighting 25Aug 20, 2009 1:07 pm dymonite69 An interesting graph on luminous efficiency of various lighting systems: http://4.bp.blogspot.com/_3iqp6erxj3s/S ... r+watt.jpg LEDs are better than this graph states. You can get 100 lumnes per watt from a good quality LED. Also, looking at the chart, we should all be moving to metal halide lighting for our main living areas. Very effecient and lights in this area would account for most of the lighting power in a house. The good thing about living areas is that the lights go on at sunset and pretty well stay on for most of the night before bedtime, so any turnoff/turnon problems with metal halides is not a real issue. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: LED lighting 26Aug 20, 2009 1:46 pm Casa2 On this last itme, most of your lights will never have to be repalced - they'll tear the building down to build a new one before you replace the majority of the lights. Casa2 LEDs are better than this graph states. You can get 100 lumnes per watt from a good quality LED. From the Philips Luxeon range website: They quote a wide range of luminous efficacies for White LED ranging from 63-100 lumen/W. http://www.philipslumileds.com/products ... bel-white/ Compared this to CFLs 50-70. Fluoro tubes 70-100. Normal incandescent 15-20. If you look at the advertised equivalent light outputs of most retailed LEDs it generally is around 10W LED = 50W Halogen. This is not much different from CFLs. The useful life is defined conventionally as when light output falls to 80% of original (not to zero). This is operating temperature dependent. Philips reckon 18000 hrs (Fluoros may be 10-15000) http://www.philipslumileds.com/technolo ... enance.cfm It is promising technology but as you say cost doesn't make it a huge economic or energy advantage. Despite improvements in luminaire design, LEDs are much more directional (more like downlights then pendants) than other forms of light sources. I would really like to see how someone would arrange a series of LED luminaires for a conventional home to provide adequate general illumination. I'd suspect it wouldn't be just a case of swapping over all your usual lights to LEDs. It would require a configuration that requires a bit more design and forethought and more lighting outlets. Building Standards; Getting It Right! 1. optional, you can but normally just use the earth from the main switch board 2. should be enough but the distance determines voltage drop - sparky should work it… 1 28812 I have a really long hallway which is 1100mm W x 11500mm L I would appreciate if anyone can give suggestions to light it up with Linear LED lights that goes from wall to… 0 8814 |