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Compact 13W fluorescent bulb with single GX23 tube, white finish

Ushio

Ushio CF13S/835 13W 3500K GX23 fluorescent bulb

SKU CH-36JD-JG4QJ

13-watt fluorescent bulb delivers 800 lumens at 3500K with 85 CRI, GX23 base, and 10,000-hour rated life

  • Power rating13
  • Light output800
  • Color temperature3500K
  • Lifespan (hours)10000
  • Color rendering85
  • Product typeFluorescent Bulbs
  • Delivers 800 lumens from only 13 watts
  • Neutral 3500K white suits offices and kitchens
  • CRI 85 renders colours accurately
  • Rated 10000 hours for fewer replacements
  • Compact GX23 2-pin fits slim fixtures

Compact fluorescent bulb for general lighting

This Ushio CF13S/835 lamp delivers 800 lumens at 3500K with a CRI of 85, drawing 13 watts and rated for 10000 hours. The single-tube, 2-pin design suits fixtures that accept a GX23 base. Its 0.50 inch diameter and 7.08 inch overall length fit many compact downlights and task lights.

Check base type and ballast compatibility

Verify the fixture uses a GX23 2-pin socket and that the existing ballast supports a 13 watt compact fluorescent lamp. The bulb’s physical envelope measures 0.50 inch in diameter and 7.08 inches long, so confirm the housing provides sufficient clearance. Ensure the supply voltage matches the ballast rating before installation.

Replaces 13 watt CFLs with GX23 bases

This unit directly substitutes any 13 watt GX23 compact fluorescent with comparable lumen output and colour quality. The upgrade is worthwhile when the old lamp has reached its 10000 hour rated life or shows reduced output and colour shift. Buyers needing a different wattage, base type, or colour temperature should select an alternative model.

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 output800
Power
Power rating13
More details
Color temperature3500K
Lifespan (hours)10000
Color rendering85

Questions about this item

What is included with the Ushio CF13S/835 bulb and does it need a separate ballast?

The box contains the single 13 watt GX23 fluorescent tube. The bulb requires a compatible fixture with an integrated electronic ballast, which is not included.

How do I choose between the 835 and other Ushio compact fluorescent codes?

The 835 code means 85 CRI and 3500 K colour temperature; select it when you need neutral white light with good colour rendering, and choose a different code for warmer or cooler tones.

What does the 800 lumen rating mean once the bulb is installed in a fixture?

In a suitable fixture the lamp delivers 800 lumens of 3500 K light at 13 watts, reaching full output after a short warm-up and lasting a rated 10 000 hours.

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