ROBERT G. HOWARD wrote:
>
> They won't burn out immediately, if that's a concern; at least they
> didn't when I turned them on. They seem to be able to take the
> overvoltage long enough for you to realise that you don't want them that
> bright. When you turn them down to a reasonable level, they're probably
> getting less than 10v anyway. Since they were rated for 1000 hours, if
> you get 1/10 of that you still have 100 hours, and that's more than 3000
> miles at 30 mph.
> As to the list of things to take in your MGB spares kit for a 3000 mi
> trip--guess we don't need to take spare instrument lightbulbs...
> Bob
>
> On Thu, 20 Nov 1997 08:05:43 -0600 "Feldman, Jack (Jack)"
> <jack@lucent.com> writes:
> >Bob,
> >Your message implies that you have turned to the rheostat to the full
> >14.4 volts without burning out the light bulbs. Can they really take
> >the
> >over voltage, or will they burn out immediately if one is not careful?
> >
> >Jack
> >
What (or should that be 'watt') is the wattage of these bulbs? In my
experience the
rheostats burn out at a point just before maximum brightness. Although the
resitive
track in the rheostat is at its widest at this point, the power dissipated
seems too
much for it, and I am wondering how the current with with 7.5v bulbs compares,
particularly if one has extra gauges on the circuit.
PaulH.
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