[opendtv] Re: LEDs shine as replacement for lightbulb
- From: "James Albro" <jalbro@xxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 16 Nov 2007 17:17:34 -0500
As I understand it, the mercury vapor discharge in the fluorescent lamp
produces UV light and the phosphors convert the UV to visible, white light.
For an LED system the UV light would be produced at the diode junction and
then converted to white light by phosphors, thus no mercury would be
required.
Jim
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, November 16, 2007 5:07 PM
Subject: [opendtv] Re: LEDs shine as replacement for lightbulb
John Shutt wrote:
> I believe the problem with CFLs is the small amount of mercury
> put into the tube, not the phosphors.
>
http://www.npr.org/templates/story/story.php?storyId=7431198
John, you're strictly right, but I believe the mercury and the phosphors
work together, to convert UV into visible light.
http://www.epa.gov/mercury/consumer.htm
"Fluorescent Light Bulbs
"Mercury is used in the long fluorescent, compact fluorescent, and
high-intensity discharge (HID) lamps. Visible light is produced when the
mercury in the lamp is electrically energized."
These white LEDs work the same way. Thay too produce mostly UV, and need
to have it converted to white light. My guess is, they will also have to
use mercury, as all fluorescents have always done.
Bert
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