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Mon Jun 02, 2003 11:25 pm

Forum: Neon, LED, Lighting

Topic: what is the LED efficiency and costs to run?

Replies: 10

Views: 5188

The big question is why do they want LEDs? If the answer is "for energy efficiency reasons", the next question is what colour is the illumination to be? (Well, non white may just work with some forms of artwork...) If the answer is white, remember the size of the solar panel will then need to be fou...

Sat May 31, 2003 12:25 am

Forum: Neon, LED, Lighting

Topic: what is the LED efficiency and costs to run?

Replies: 10

Views: 5188

Just reading my latest copy of Opto & Laser Europe (I get it for the crossword). An interview with the VP of Research and Development at Lumileds, Frank Steranka. The news looks pretty gloomy for white. He claims current costs are 10 lumens per dollar and that if the devices can get into volume,...

Fri May 23, 2003 10:43 pm

Forum: Neon, LED, Lighting

Topic: what is the electronic ballast reliability?

Replies: 2

Views: 1640

Don, I negelected to thank you for this...........thanks! I would appreciate any info you've got on the Spanish ballast if possible. I was told of a potted conventional (Spanish!) ballast. Is this any relation? I've just been informed that Tridonic have withdrawn their warranty on any of their elect...

Mon Apr 21, 2003 8:55 pm

Forum: Neon, LED, Lighting

Topic: what is the electronic ballast reliability?

Replies: 2

Views: 1640

what is the electronic ballast reliability?

I thought I'd give this a shot. I'm doing some work at present on the reliability of electronic fluorescent lamp ballasts. Some of our customers have had reports of high levels of failures of lighting ballasts when used in signage (i.e. outdoor but a bit protected) applications. It would seem that t...

Mon Apr 21, 2003 11:32 am

Forum: Neon, LED, Lighting

Topic: what is the LED efficiency and costs to run?

Replies: 10

Views: 5188

Rob,

I just realised "Don's Lighting page" looks like it might be the same Don as our Don. Not so, alas. If it were it would contain only verified fact. So use with a little care...


http://misty.com/people/don/light.html

Mon Apr 21, 2003 11:24 am

Forum: Neon, LED, Lighting

Topic: what is the LED efficiency and costs to run?

Replies: 10

Views: 5188

Don, I've just ordered my copy of the Dennett. Many thanks for that. As we agree, the big problem is white LEDs. The reason for me showing the lumens per dollar figure is to show the shocking cost of white light from LEDs. This high cost lies at the root of why white LEDs are proving to be so much l...

Sun Apr 20, 2003 8:59 pm

Forum: Neon, LED, Lighting

Topic: how bright can the illuminated sign be?

Replies: 16

Views: 6211

Don, I completely agree with you on the wrongness of the third edition, both in brightness levels and in failing to distinguish between intermediate sizes. I maintain, however, that there is an increasing preponderance of overbright signs even given edition two levels. Unsurprisingly these are gener...

Tue Apr 15, 2003 11:41 pm

Forum: Neon, LED, Lighting

Topic: what is the LED efficiency and costs to run?

Replies: 10

Views: 5188

what is the LED efficiency and costs to run?

I just thought I'd restart the LED debate with a few more facts. First, LEDs are here to stay. They're just so darn convenient. But Paul's comments a while back in another LED discussion underlines their cost and use limitations. In a nutshell they're great for small signs ( small channel letters, s...

Mon Apr 14, 2003 8:19 pm

Forum: Neon, LED, Lighting

Topic: how bright can the illuminated sign be?

Replies: 16

Views: 6211

Overbright Signs?

Don’s point about sign brightness is an intriguing one. I have noticed a trend in recent years of increasing brightness in fluorescent illuminated signs. (I put this down in part to the increasing adoption of triphosphor tubes and HF control gear.) I wonder if the new recommendations in ILE5 ed3 mig...

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