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Small clear T3.5 incandescent bulb with G6.35 bi-pin base

Ushio

Ushio SM-18769 40W 22.8V G6.35 Incandescent Standard Bulb

SKU CH-H85R-01EJ9

A 40-watt, 22.8-volt incandescent bulb with a G6.35 base delivering 850 lumens at 3000K for 700 hours

  • Power rating40
  • Light output850
  • Color temperature3000K
  • Lifespan (hours)700
  • Product typeIncandescent Bulbs
  • 850 lumens at 3000 K for bright warm light
  • 40 W at 22.8 V matches scientific equipment specs
  • G6.35 two-pin base fits T-3.5 sockets directly
  • CC-6 filament rated for 700 hours of continuous use
  • Compact 43.2 mm length suits tight instrument housings

Scientific & Medical Illumination

The Ushio SM-18769 is a 40 watt, 22.8 volt incandescent lamp built for scientific and medical instruments. It delivers 850 lumens at a 3000K colour temperature with a rated life of 700 hours. The clear T-3.5 envelope and CC-6 filament suit precision optical paths.

G6.35 Two-Pin Integration

The G6.35 bi-pin base slots directly into compatible sockets without adapters. At 1.700 inches overall length and .433 inches diameter, the compact T-3.5 envelope fits tight housings in microscopes, analysers and fibre-optic illuminators. The low 22.8V requirement matches dedicated low-voltage power supplies.

Thermal & Power Profile

At 40 watts the lamp runs warm but stays within the thermal envelope of standard low-voltage fixtures. The CC-6 filament stabilises quickly for consistent output during the 700-hour rated life. No forced cooling or external ballast is needed beyond the fixture's own supply.

How it compares

Measured against everything we stock in General-Purpose & Specialty Bulbs, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 77% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand nameUshio
Product typeIncandescent Bulbs
Display
Light output850
Power
Power rating40
More details
Color temperature3000K
Lifespan (hours)700

Questions about this item

How many hours of continuous use does the 700-hour rated life provide before the CC-6 filament is expected to fail?

The manufacturer rates the lamp for 700 hours of average continuous use before the CC-6 filament reaches end of life.

What heat output should be expected from the 40 W incandescent envelope when run all day in a G6.35 fixture?

As a 40 W incandescent, nearly all input power becomes heat; the T-3.5 envelope reaches high surface temperature and requires a ventilated G6.35 socket rated for the load.

Which G6.35 socket voltage must the existing fixture supply for the 22.8 V lamp to operate correctly?

The fixture must deliver 22.8 V to the G6.35 base; the lamp will not reach rated output or life at any other voltage.

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