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18W Ushio compact fluorescent bulb with T4 base

Ushio

Ushio CF18D/835 18W Compact Fluorescent Bulb

SKU CH-3QC1-0ZST7

An 18 W compact fluorescent bulb delivering 1200 lumens at 4100 K with an 82 CRI and 10000-hour rated life

  • Power rating18
  • Light output1200
  • Color temperature4100K
  • Lifespan (hours)10000
  • Color rendering82
  • Product typeFluorescent Bulbs
  • 18 W compact fluorescent delivers 1 200 lumens for bright, efficient lighting
  • 4 100 K cool-white tone suits kitchens, offices and task areas
  • CRI 82 renders colours accurately for everyday visual tasks
  • 10 000-hour rated life reduces replacement frequency and maintenance
  • T4 base fits standard compact fluorescent fixtures without adapters

Product Identity

The Ushio CF18D/835 is an 18 watt compact fluorescent bulb designed for general indoor lighting in residential or commercial fixtures. It delivers a neutral white output suitable for workspaces, kitchens and utility areas where consistent colour rendering matters.

Interface Limits

The lamp uses a standard T4 base and operates at 18 watts with a rated output of 1200 lumens at 4100 kelvin. Its colour rendering index of 82 provides adequate fidelity for everyday tasks but falls short of the higher values required for critical colour evaluation or professional photography.

Installation Notes

Installation is a simple push-and-twist action into a compatible T4 socket; no additional wiring or ballast replacement is needed if the fixture already supports compact fluorescent lamps. The main issue arises when the bulb is fitted into an enclosed or poorly ventilated fitting, which can reduce the rated 10000 hour life and cause premature dimming.

How it compares

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

Price $5.99
Cheaper than about 90% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand nameUshio
Product typeFluorescent Bulbs
Display
Light output1200
Power
Power rating18
More details
Color temperature4100K
Lifespan (hours)10000
Color rendering82

Questions about this item

Which version of the Ushio CF18D/835 should I choose for a fixture that takes an 18W T4-base compact fluorescent?

The bulb is an 18W T4-base compact fluorescent rated at 1200 lumens, 4100K colour temperature and 82 CRI, so select this exact model when your fitting requires those specifications.

What does the 1200-lumen rating mean once the bulb is installed in a real fitting?

It delivers 1200 lumens of cool-white light at 4100K with an 82 CRI, providing consistent output for general indoor lighting over its 10000-hour rated life.

What base standard does the CF18D/835 use and what does that limit in practice?

It uses a T4 compact fluorescent base, which restricts use to fixtures designed for that specific 4-pin T4 socket and 18W electronic ballast.

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