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halogen lamp light bulb
1121
donsbulbs part:
788 USA
H/6V/20W/G4/T3/CL/100H
enter quantity:   
quantity discount:
bulb quantity:  1+    4+    8+  
price per bulb:  $30    $28.50    $27.07  

788 USA
H/6V/20W/G4/T3/CL/100H

bulb specifications:
  
category: Halogen lamp
volt: 6
amp: 3.33
watt: 20
base: G4 - Sub-Miniature 2-pin
round pins 0.7mm diameter; 4mm centered
(found on glass base bulbs)
glass base does not have grip channel cut
glass: T3
filament: C6
fil.res.: 1.8 ohm
m.o.l.: 1 inch (25.4MM)
l.c.l.: 0.77 inch (19.6MM)
i.lumens: 32
cp: 2.5
d.hours: 100
notes: clear glass
specs verified against ANSI-SR25D1997
 
uses sockets:DB-QRX4
DB-TP56
DB-TP61


typical photo of 788 USA
H/6V/20W/G4/T3/CL/100H bulb type
(your bulb may look slightly different)


typical shape of T3 glass envelopes
(not to scale)


typical shape of C6 filament
(not to scale)


industry standards for base:
G4 - Sub-Miniature 2-pin
round pins 0.7mm diameter; 4mm centered
(found on glass base bulbs)
glass base does not have grip channel cut
(not to scale)


Don's grand wisdom: When multiple bulbs are in a circuit; if one bulb burns out, you really should replace all bulbs at same time. This way all bulbs will look the same. Otherwise, mixing "used" bulbs with "new" bulbs (or mixing brands) will each look different (some will be dimmer, some a different shade of color.) For example, automobile headlights and tail-lights must always be replaced in pairs or they will look odd. And, when one bulb is at it's end of life, the other will be near it's end of life too. Keep good working "used" bulbs as emergency spares.

Although few specialty light bulbs and sockets are manufactured anymore, I have decent inventories of most types in stock, plus additional sources for nearly everything. All are guaranteed brand new, most being NOS (new old stock). Shelf life is forever.

Prices usually rise as inventory is sold off. Website updated daily to reflect current stock and prices. Click add to cart button above, and order at today's prices.

I don't guarantee brand (or country) of manufacture, but you are welcome to suggest a preference. If you do require a certain brand or specific country of manufacture; read my general information.

I need your help! I'm doing everything possible to provide free accurate bulb data and cross-referencing. If you have additional information or found errors, click here.

Thanks to you;  donsbulbs is the world's largest resource of bulb data and cross-referencing.

Thank you, Don Schnapp


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Definition of light bulb refers to lamp.
Definition of socket refers to lampholder (lamp holder).


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788 USA
H/6V/20W/G4/T3/CL/100H

also known as
Cross-Reference:


2F610 GRAINGER
12-LABORLUX LEITZ/LEICA
20EB-DIALUX LEITZ/LEICA
31-31-81-01/6V/20W BAUSCH/LOMB
31-31-81-01/6VOLT/20WATT BAUSCH/LOMB
31-31-81-01/1121/6V/20W BAUSCH/LOMB
31-31-81-01/1121 BAUSCH/LOMB
31-31-81-01 BAUSCH/LOMB
31-31-81-01 BULBDIRECT
31-31-81-10/6V/20W BAUSCH/LOMB
31-31-81-10/6VOLT/20WATT BAUSCH/LOMB
31-31-81-10/1121/6V/20W BAUSCH/LOMB
31-31-81-10/1121 BAUSCH/LOMB
31-31-81-10 BAUSCH/LOMB
31-31-81-10 BULBDIRECT
31-31-81-MICROSCOPE BAUSCH/LOMB
31-31-81/BAUSCH/LOMB INTERLIGHT
31-31-81 BAUSCH/LOMB
90-10-53/6V/20W ZEISS
90-10-53 ZEISS
788-GE/T2-1-4-6V-20W-BIPIN LAMPTECH
788-GE LAMPTECH
788/6V/3.33A/HALOGEN/43117-GENERAL-ELECTRIC ANDRE
788/6V/3.33A/HALOGEN/43117 GENERAL-ELECTRIC
788/6V/3.33A/HALOGEN/T2.25/G4 MICROLAMP
788/6V/3.33A/HALOGEN ANDRE
788/6V/3.33A/T2.25/G4/HALOGEN
788/6V/3.33A/T2.25/G4 EIKO
788/6V/3.33A USA
788/6V/20W USA
788 ANSI
788 BULBDIRECT
788 EIKO
788 GENERAL-ELECTRIC
788 INTERLIGHT
788 MICROLAMP
788 OSRAM
788 STANDARDPRO
788 SYLVANIA
788 USA
788 USHIO
788 WESTINGHOUSE
01111/6V/3.35A/G4/T2.3/C6/37MSCP/3325K/100H WELCH-ALLYN
01111/6V/3.35A/WA-S/T2.2/37MSCP/3325K/HALOGEN/100H WELCH-ALLYN
01111/6V/20W WELCH-ALLYN
01111 WELCH-ALLYN
1120-MICROSCOPE AMERICAN-OPTICAL
1120/6V/20W AMERICAN-OPTICAL/REICHERT
1120/6VOLT/20WATT AMERICAN-OPTICAL/REICHERT
1120/AMERICAN-OPTICAL INTERLIGHT
1120/LEICA INTERLIGHT
1120/PROJECTOR AMERICAN-OPTICAL
1120/PROJECTOR AMERICAN-OPTICAL/REICHERT
1120/PROJECTOR REICHERT
1120 AMERICAN-OPTICAL
1120 AMERICAN-OPTICAL/REICHERT
1120 BULBDIRECT
1120 GERATE
1120 LEITZ/LEICA
1120 OLYMPUS
1120 OLYMPUS/GERATE
1120 OPTICAL
1120 REICHERT
1121-MICROSCOPE AMERICAN-OPTICAL
1121/6V/20W AMERICAN-OPTICAL/REICHERT
1121/6VOLT/20WATT AMERICAN-OPTICAL/REICHERT
1121/778 AMERICAN-OPTICAL/REICHERT
1121/788 AMERICAN-OPTICAL/REICHERT
1121/788 GERATE
1121/788 OLYMPUS
1121/788 OLYMPUS/GERATE
1121/AMERICAN-OPTICAL INTERLIGHT
1121 AMERICAN-OPTICAL
1121 AMERICAN-OPTICAL/REICHERT
1121 BULBDIRECT
1121 GERATE
1121 OLYMPUS
1121 OLYMPUS/GERATE
1121 OPTICAL
1121 REICHERT
13634 STANDARDPRO
41404 EIKO
41404 UPC
43117-GENERAL-ELECTRIC ANDRE
43117/6V/3.33A/HALOGEN/T2.25/G4 MICROLAMP
Know a cross-reference for this bulb
to add to this list?


Please enter:
bulb number
brand of bulb
43117 GENERAL-ELECTRIC
43117 MICROLAMP
313181 BAUSCH/LOMB
901053 ZEISS
8000255 USHIO
31318101 BAUSCH/LOMB
31318110 BAUSCH/LOMB
031293414045 EIKO
69549136342
69549136342UPC STANDARDPRO
CH2-SERIES-MICROSCOPE OLYMPUS
CH2-SERIES OLYMPUS
DIALUX20EB-MICROSCOPE LEITZ/LEICA
H/6V/3.33A/G4/CAPSULE/100H
H/6V/3.33A/G4/T2.25/100H
H/6V/20W/G4/CAPSULE/100H/788 USA
H/6V/20W/G4/T2.25/100H
H/6V/20W/G4/T2.25/100H/788 USA
H/6V/20W/G4/T2.25/CL/100H/788 USA
H/6V/20W/G4/T2.5/100H/788 USA
H/6V/20W/G4/T2.75/100H/788 USA
H/6V/20W/G4/T3/100H/788 USA
H/6V/20W/G4/T3/CL/100H/788 USA
H/6V/20W/G4/T3/CL/100H 788 USA
H/6V/20W/T2.25/100H/01111 WELCH-ALLYN
H048 HYBEC
ID03-MICROSCOPE ZEISS
ID03 ZEISS
II-LABORLUX LEITZ/LEICA
K-LABORLUX LEITZ/LEICA
LABOPHOT-MICROSCOPE NIKON
LABOPHOT-POL NIKON
LABOPHOT NIKON
LABORLUX-MICROSCOPE LEITZ/LEICA
LABORLUX12-MICROSCOPE LEITZ/LEICA
LABORLUXII-MICROSCOPE LEITZ/LEICA
LABORLUXK-MICROSCOPE LEITZ/LEICA
MA-260-05 MEIJI
MA260-05 MEIJI
MA260/05/6V/20W MEIJI
MA260/05/6VOLT/20WATT MEIJI
MA260/05/MEIJI INTERLIGHT
MA260/05 BULBDIRECT
MA260/05 MEIJI
MA260/05 SWIFT-INSTRUMENTS
MB-07780
MICROSCOPE/1120 AMERICAN-OPTICAL/REICHERT
MICROSCOPE/1121 AMERICAN-OPTICAL/REICHERT
NIKON LABOPHOT
PABOPHOT-MICROSCOPE NIKON
PABOPHOT NIKON
Q20T3G4-6V100H/788 DONSBULBS
SL-3C-SLIT-LAMP-FIX/H048 TOPCON
SL3C-FIX/H048 TOPCON
SL990/5-SLIT-LAMP CSO
SL990/5 CSO
SLIT-LAMP-SL990/5 CSO
SM-788 USHIO
SM788 USHIO
T2.25/CL/6V/3.33A/G4 STANDARDPRO
WA-01111 WELCH-ALLYN
WA01111/6V/3.35A/G4/T2.2/C6/37MSCP/3325K/HALOGEN/100H WELCH-ALLYN
WA01111/6V/3.35A/G4/T2.3/C6/37MSCP/3325K/100H WELCH-ALLYN
WA01111/6V/3.35A/WA-S/T2.2/37MSCP/3325K/HALOGEN/100H WELCH-ALLYN
WA01111/6V/20W WELCH-ALLYN
WA01111/6VOLT/20WATT WELCH-ALLYN
WA01111 BULBDIRECT
WA01111 WELCH-ALLYN

788 USA
H/6V/20W/G4/T3/CL/100H

have been found in equipment:
Bausch and Lomb Incorporated
31-31-21 Medical

Olympus
Microscope

Welch Allyn
WA-01111 Medical
WA01111 Medical
Know any equipment using this bulb to add to this list?
Enter as much information as possible: example:
manufacture name:  Bell & Howell
model number #:  1480
model name:  Multi-Motion
size:  8mm
type of equipment:  projector
notes:  only the green one
comments:  any comments