Equinoxstudios wrote:I'm just waiting for a nice evening after work to fit the pair of 50W LED bulbs I have sourced to my 94MY foglight units. In theory they shouldn't baffle the BFM's as they should draw the necessary amount of current to satisfy them. I guess I'll find out soon.
BTW I've never seen the bulb fail light illuminate to indicate a failed bulb unless that bulb is meant to be on (i.e. you only know that you have a duff headlight until you actually turn on the headlights).
So Norman are you saying that the BFM's actually know the bulb is duff before you try to turn it on? If that is true then the BFM is measuring the passing of a small current through the filament - too small to make it light up but big enough to know that the bulb is there - that's what we call "quiescent" current .
If the BFM only indicates failure when you turn the bulb on then the BFM is not measuring quiescent current but instead is only measuring the current drawn by the bulb when voltage is applied.
So how intelligent are our BFM's?
Equinoxstudios wrote:Hi Norman, I've only tried mounting the LED units into a spare foglight I have in the workshop - I wasn't going to fit it to the car until I was happy with the light output.
So no verdict yet on whether the BFM throws up a fail...
Equinoxstudios wrote:Well, the light output simply isn't comparable. The LED replacement is poor. Only two of the ten LEDs in the unit are pointing forwards, the remaining eight are shining out the sides. and because they are not at the focal point of the reflector they may as well not be there!
So this 50W unit ends up with about 10W of LEDs shining out the front. The shadow line is nice and crisp since the LEDs are near enough a point source but the LUX levels are way down on the standard quartz-halogen H3.
I could try experimenting with a reflector optimised for the side facing LEDs because without them it's pretty damn useless
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