firstname.lastname@example.org (HA HA Budys Here) wrote:
It's not the "getting loose" that bothers me although indeed I've had
one where the sprung contact in the base was permanently pushed down
and the bulb made an intermittent contact even when tightened as much
as possible. It's the screw becoming welded into the socket that's the
problem and it usually occurs with a rarely used light at the limit of
the available ladder. The result is a broken bulb and sometimes cut
I've lived with both. Apart from any differences in the quality
of the sockets both have some disadvantages IMHO.
UK style bayonet. Contact pressure on the two contacts on the
base usually depends on two small springs inside the small piston
style electrodes of the socket. The bayonet style bulb is
inserted, pressed down, turned a few degrees; two pins, one each
side of the bulb engaging with hooked slots in the socket (as
somebody said, as some automobile lamps) and then released with
the small springs maintaining the contact pressure and holding
the bulb in place. I found that a very small screwdriver was
required to attach wires within the base of many UK bulb sockets
and if one of the small screws went astray they were hard to
find/replace. Also that any damage to the hooked slots could
cause, occasionally, bulb to be loose or wobbly in the socket.
many sockets were brass and of good quality.
North American (Edison Screw). While NA polarized plugs are now
more common it is possible for the outside of the bulb socket to
be 'live' if improperly wired. However one's fingers are not
usually down at the base of the bulb and if one is prudent the
lamp/circuit is switched 'off'!
Because of the lower voltage (115-120) compared to 230, the
current at each bulb is higher i.e. twice. However with the
relatively large contact area of the screw in base and the metal
contact on the bottom, unless there has been corrosion, doesn't
seem to be a problem. It does require several 'turns' to screw
them in, but this sets the contact pressure required. I think the
screw in type does allow cheaper materials to be used for
construction but this is only a personal opinion and UK
experience now out of date.
Both work. Bulbs are an inefficient source of light. Many lamps
are now made in China or somewhere. Current price for a package
of four 40s, 60s or 100 watters is here (eastern Canada at Can.
Tire/Wal Mart etc.) around 88 Can. cents, plus sales tax; or
approximately UK 44 pence (11 pence each). So they are cheap
enough even compared to the price of the electricity they waste.
(Well if one is heating with electricity anyway, during the
winter, that heat is part of ones heating bill!).
Because it is a fix looking for a problem. In over 50 years I have
never seen a problem related to screw in lamps. I have seen problems with
both systems, but not related to design as they both share the problems,
generally do to poor materials and or design.
Yes, they do. But not all of them.
Many also run on the 600v DC track voltage, which is fed in series through 5
Temporary lights on construction projects are also left hand thread. To cut
down on theft, and to prevent the use of receptacle adaptors in the non-gfci
protected 2-circuit stringers.
sounds like another case of "the grass appears greener from the other side
of the fence".bet you, that in the UK there are people who wish they had
our light bulbs. people always want what the other guy has,you should see my
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