Date: Mon, 05 Jul 2004 20:59:50 GMT From: "James Sweet" <jamessweetnospamail.com> Subject: Re: Led replacement bulbs
"Goran Larsson" <hohnospamlid.invalid> wrote in message news:I0E9Gp.Mnnospamove.se... > In article <95rie0le7u26o49jko5rgqio2rt68ea8nvnospamcom>, > Steven Stern <sdsternNOSPAMHEREnospamAMHEREmindspring.com> wrote: > > > If I may tack on here, are there any replacements for the H7 headlight bulbs > > that have a reasonable lifetime? > > "Long life" types of H7 bulbs are available. The downside is less > light output. > > High output types are also available. The downside is shorter life. > > More details about bulb lifetime are available on my homepage: > < http://www.nospam.com/saab/faq_electrical.shtml#lamps > > > One 0.33 ohm (50W) resistor used to drop the voltage to both H7 > bulbs will lower the voltage enough to drastically increase the > lifetime without lowering the output too much and still keep the > halide cycle going. > > > If I may tack on here, are there any replacements for the H7 headlight bulbs > > that have a reasonable lifetime? I seem to go through one every six months. > > On October 7:th, 2001, I replaced my H7 bulbs with high output, short > lifetime, bulbs. They get full voltage with light switch in the right > position (night time driving) and reduced voltage (with 0.33 ohm resistor) > in the left position (daytime driving). I'm still using the same bulbs now, > almost three years later. > > -- > G–ran Larsson http://www.nospam.com/saab/ Better than using a resistor would be a chopper circuit to reduce the duty cycle. You can make one with a power mosfet with sufficient current rating and a 555 timer chip. Lots of electronics info out there on the net.
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