Infared light for night time

Diagram here if anyone interested? it can be made up on veroboard if you are
not bothered about a PCB one.
The more leds on the cicuit the better the night vision.
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Reply to
George
Whats the best infareds for this project,Blue or Clear? as I found this site out of a few to be a lot cheaper in price.
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Reply to
George
Probably part number 720-530 on page 21. Those will give 80mW radiant power each, if you adjust the resistors to put 100mA through each string of LEDs. Using a 12v supply you could make R1-R8 15 ohms rather than 39 ohms. This is running them close to their maximum so perhaps a slightly higher value may be better... Note that your total load current would be 400mA, so this isn't really for battery operation.
Reply to
mick
Why use LEDs when filament lamps radiate IR well when run at under half rated voltage. Producing IR is the filament lamp's forte, or weakness when you want visible.
NT
Reply to
meow2222
wrote in message
Hmmm! yes I can see my electricity bill now. ;-)
ps I don't want to resemble part of blackpool illuminations
Reply to
George
I suspect that they will be much more efficient than filament bulbs as the energy produced is monofrequency and the beam width is quite narrow (40 degrees for the part number given). Filament bulbs waste a lot of power radiating well into the visible region (even at half voltage) and also radiate in all directions.
It would be interesting to test this.
Reply to
mick
In message , George writes
How much longer will a filament lamp last at 50% it's rated voltage ?
Reply to
geoff
On 1 Feb,
From experience of using two in series in a past life, I'd say for ever, unless they were 15w pigmy.
Reply to
<me9
In message , snipped-for-privacy@privacy.net writes
S'wot I was thinking
I used to use pigmys as loads for soak tests and found that even they lasted almost forever when run at lower voltages
Reply to
geoff

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