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23/1/2008 at 8:49pm
Location: south yorkshire Outfit: coachman Amara 450
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A white led needs a voltage of 3.3v and current 0f 35mA to 70mA. This means you cant connect direct to a 12v supply.
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yes you do,. the ones pictured in the link above already have the resistors embedded in the base . you just replace the halagen ones direct with led ones
stu
------------- I predict a riot !!
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23/1/2008 at 10:35pm
Location: Near Bremen Germany Outfit: Ci 620 Motorhome on Ford chassis
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I think I explained that badly. The reflector type LED bulbs, the one shown in Sean's link being 4 flat-pack LED's with 120° flood, onto a G4 glass base are indeed 12 v. But, they use an 33mA-42mA 'CLD', see my circuit. This 'Current Limiting Diode' would drive up to 30-40 LEDS. You can get up to 60 LEDS in one glass housing, but to put 60 resistors would not fit in. The reason for the CLD is very simple. The LED is not a bulb with a filament, but a 'Semiconductor'. This means that what you are seeing is chip, glowing when current flows. The amount of current is determine by the chip and is quite fine. Between running and its off state, is something like 2mA to 6mA. And between running and destruction is again very fine, something like 10mA. This all means, that 25mA, no light and 40mA destruction.
I was refering to leds in cupboards, in bed lockers etc. For anti germ in the water I have 6 Infra red diods (10 000MCD), and this does work. I hope all helps
Mike
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