Identifying Common Bi-Pin Bases

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HARRINGTON LIGHTS  is pleased to
provide the following help for 


** two-pin bases that allow the bulb to be pushed straight into the socket.  See also: GU10 (a "turn & lock" base).

We know very well that trying to identify a halogen bulb, for instance, that has two small pins protruding from it can be quite a puzzle.  Where and how does one measure?  How precise does the measuring instrument have to be?  How much experience in measuring does one need in order to be proficient in declaring the correct spacing of the pins?  Finally, the most disturbing question of all: IF THE PINS ARE BENT AT ALL, HOW CAN I MEASURE THE "ON CENTER" SPACING?

HARRINGTON LIGHTS has developed the following field expedient method for identifying these bi-pin bases and the equipment list below is sufficient to allow correct identification of any of four common bi-pin bases:

Equipment needed:

US coins:  (2) nickels, (4) quarters, (1) dime

Using the coins as thickness gauges, they may be combined as follows in order to determine which combination will fit nicely between the pins of the mystery bulb:

(1) nickel and (1) dime = G4 base

(2) nickels = G5.3 base

(3) quarters = GY6.35 base

(4) quarters = GY8 base**

**GY8 has always been 8.6 spacing.  Only recently have some retailers taken to marking their products 8.6 in order to trick customers into thinking that GY8 differs from 8.6.  It does not; and even if it did, 0.6mm difference in spacing would not matter in the fit of a bulb in a socket.

The combinations listed above will fit between the pins without appreciable "wiggle" and the right combination can slide all the way to the glass without meeting any resistance.

(The following is for entertainment purposes only:)

Bi-Pin Base Identification and Multi-Purpose Kit:

You may get ours, or build your own:

Basic Kit (includes equipment listed above):  $19.95

Professional Kit (includes all equipment for testing all four bases simultaneously):  (two monthly payments of) $19.95

If the above kits are used in "multi-purpose" mode, you will find that certain parts will have to be considered "used up" and will require replacements.  All of the parts are available individually at a cost of $6.95 each.

NOTE:  Some of the above is useful information and some is a joke.  The dividing line is indicated by the row of **** !!



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