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Ushio 18W compact fluorescent double tube 2-pin base 4100K

Ushio

Ushio 18W CF18D/841 Compact Fluorescent Bulb 4100K 1140lm

SKU CH-1M6T-WW4W9

An 18W double-tube compact fluorescent bulb with a 2-pin base delivering 1140 lumens at 4100K and a 10000-hour rated life

  • Power rating18
  • Light output1140
  • Color temperature4100K
  • Lifespan (hours)10000
  • Color rendering82
  • Product typeFluorescent Bulbs
  • 18 W delivers 1140 lumens for bright cool-white light
  • 4100 K colour temperature suits workspaces and kitchens
  • 10000-hour rated life reduces replacement frequency
  • CRI 82 renders colours accurately for everyday tasks
  • Double-tube 2-pin base fits compatible compact fluorescent fixtures

Compact fluorescent for general lighting

The Ushio CF18D/841 is an 18W double-tube compact fluorescent bulb with a 2-pin base. It delivers 1140 lumens at a 4100K colour temperature for neutral white light. A colour rendering index of 82 makes it suitable for everyday indoor use. Rated life is 10000 hours.

Cool operation and low power draw

At 18W the bulb draws minimal power and produces far less heat than an equivalent incandescent lamp. It runs quietly with no audible ballast hum in normal fixtures. The fluorescent technology keeps surface temperatures modest during extended use. Power consumption stays consistent over the rated lifetime.

Direct retrofit with no extra gear

The 2-pin base fits existing compatible sockets without adapters or rewiring. No external driver or starter is required because the ballast is integrated in the fixture. Instant start is not guaranteed; a brief warm-up to full brightness is typical. The bulb contains mercury and must be recycled at end of life.

How it compares

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

Price $3.99
Cheaper than about 94% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand nameUshio
Product typeFluorescent Bulbs
Display
Light output1140
Power
Power rating18
More details
Color temperature4100K
Lifespan (hours)10000
Color rendering82

Questions about this item

How do I install the 2-pin base on this 18W CF18D/841 bulb and what is the common mistake?

Align the two pins with the socket slots and push straight in until the bulb seats firmly; the frequent error is twisting the bulb, which bends or breaks the pins because this base has no twist-lock mechanism.

What maintenance or replacement will the CF18D/841 need after its rated life?

The lamp is rated for 10000 hours; once output drops noticeably or the tube fails to start, replace the entire 18W double-tube unit — no internal parts are serviceable.

What limit appears first when the CF18D/841 runs continuously for long periods?

Continuous operation accelerates electrode wear and phosphor ageing, so the 10000-hour rated life is reached sooner than with intermittent use, and lumen output falls below the 1140lm specification.

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