RE: Re[2]: Ervan LED's again!!

["Dave McLaughlin" <dave@xxxxxxx>]

Hi Ian,

Hopefully I should have mine tomorrow as I received an email from them
saying that it was sent out Friday.

I also emailed them before for specs but got no reply. I may try again
seeing as they did reply very quickly about my order. I don't need any
manufacturer details, just the forward voltage and nominal current.

Good to hear that they are bright. I am hoping that the 20cd is very bright
compared to the 1.5cd bright blue ones I have from Farnell, and they are
bright. The blue one on my boiler is running at 18mA and lights up my
garage
enough to make out details at night each time it flashes on (runs at 1
second flash rate).

Regards
Dave...
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-----Original Message-----
From: Ian Lowe [mailto:ian@xxxxxxx]
Sent: 23 November 2003 16:25
To: ukha_d@xxxxxxx
Subject: Re: Re[2]: [ukha_d] Ervan LED's again!!


----- Original Message -----
From: "Ian Lowe" <ian@xxxxxxx>
> I drove them with a nice clean 5V supply through a 330 ohm resistor,
so
> I'm thinking 0.7v dropped across the led, 4.3 through the resistor,
> sticking it into ohm's law gives me 13mA, so I'm not even tickling the
LED.

and in typical fashion, this is wrong ;)

The forward voltage on these White Leds is about 2.4V, rather than the 07V
dropped across a simple signal diode...

and in that case, I'm only pushing 7mA (seven!!) though the LED..

These guys are gonna be INSANELY bright at full power!
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