1. Product Overview
This manual provides essential information for the safe and efficient use of your OSRAM HO 24W/840 Straight T5 Fluorescent Tube Light Bulb, model 591643. This 24-watt, 22-inch T5 fluorescent tube features a Miniature Bi-Pin (G5) Base and emits a 4,000K Cool White light, part of the Lumilux series.

Image: OSRAM HO 24W/840 Straight T5 Fluorescent Tube Light Bulb, showing its straight tube shape and G5 bi-pin base.
Key features include:
- Color/Finish: Cool White
- Color Temperature: 4,000K
- Average Lifetime: 24,000 hours
- Lumens (light output): 1750 lm
- Wattage: 24 watts
- Voltage: 120 volts
2. Safety Information
Please read and understand all safety instructions before installation or operation. Failure to follow these instructions may result in electric shock, fire, or other hazards.
- Risk of Electric Shock: Always disconnect power to the fixture before installing, removing, or servicing the bulb.
- Handle with Care: Fluorescent tubes are made of glass and can break. Avoid dropping or striking the bulb.
- Proper Disposal: Fluorescent bulbs contain small amounts of mercury. Dispose of them according to local regulations. Do not dispose of in regular household trash.
- Compatibility: Ensure the bulb's specifications (wattage, voltage, base type) match your fixture's requirements. This bulb is designed for T5 fixtures with a G5 bi-pin base.
- Indoor Use Only: This product is intended for indoor use.
- Dimmable Feature: This bulb is dimmable. Ensure your dimmer switch is compatible with fluorescent lighting.
3. Setup and Installation
Follow these steps for safe installation:
- Power Off: Turn off the power supply to the lighting fixture at the circuit breaker or fuse box before beginning installation.
- Allow Cooling: If replacing an existing bulb, allow it to cool completely before handling.
- Remove Old Bulb (if applicable): Gently twist and pull the old fluorescent tube from its sockets.
- Insert New Bulb: Align the two pins of the new OSRAM T5 bulb with the slots in the fixture's sockets. Gently push the bulb into the sockets and rotate it until it clicks securely into place. Ensure both ends are firmly seated.
- Restore Power: Once the bulb is securely installed, restore power to the fixture.
- Test: Turn on the light switch to confirm proper operation.
If the bulb does not light up, ensure it is properly seated in the sockets and that power is restored to the fixture.
4. Operating Instructions
This fluorescent tube operates like a standard light bulb once installed in a compatible fixture. Simply use the fixture's switch to turn the light on or off.
- Dimmable Functionality: If connected to a compatible fluorescent dimmer switch, you can adjust the light output. Refer to your dimmer switch's instructions for specific operation.
- Warm-up Time: Fluorescent bulbs may require a brief warm-up period (a few seconds) to reach full brightness, especially in colder environments.
5. Maintenance
Minimal maintenance is required for this fluorescent tube.
- Cleaning: To clean the bulb, ensure the power is off and the bulb is cool. Gently wipe with a soft, dry, lint-free cloth. Do not use liquid cleaners or abrasive materials.
- Replacement: Replace the bulb when it reaches the end of its average lifetime (24,000 hours) or if it begins to flicker excessively or fails to illuminate.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Bulb does not light up. | No power to fixture. Bulb not properly seated. Faulty ballast (in fixture). Bulb has reached end of life. | Check circuit breaker. Re-seat bulb firmly. Consult a qualified electrician. Replace bulb. |
| Bulb flickers. | Loose connection. Cold environment. Ballast issue. Bulb nearing end of life. | Ensure bulb is seated firmly. Allow warm-up time. Consult a qualified electrician. Replace bulb. |
| Dim light output. | Incorrect dimmer type. Bulb nearing end of life. | Ensure dimmer is compatible with fluorescent bulbs. Replace bulb. |
If problems persist after attempting these solutions, consult a qualified electrician or contact OSRAM customer support.
7. Specifications
| Attribute | Value |
|---|---|
| Brand | OSRAM |
| Model Number | 591643 |
| Light Type | Fluorescent |
| Wattage | 24 watts |
| Voltage | 120 Volts (Accepted frequency: 100 to 120 Volts and 60 Hertz) |
| Bulb Shape Size | T5 |
| Bulb Base | Miniature Bi-Pin (G5) |
| Light Color | Cool White |
| Color Temperature | 4000 Kelvin |
| Brightness | 1750 Lumens |
| Average Lifetime | 24,000 hours |
| Special Feature | Dimmable |
| Shape | Straight |
| Material | Copper |
| Indoor/Outdoor Usage | Indoor |
| Color Rendering Index (CRI) | 95 |
| Product Dimensions | 0.75 x 0.83 x 22.44 inches |
| Item Weight | 3.52 ounces (0.22 Pounds) |
8. Warranty and Support
For warranty information or technical support, please contact OSRAM customer service. Keep your purchase receipt as proof of purchase.
For further assistance, you may visit the official OSRAM website or contact their support channels. Specific warranty terms may vary by region and retailer.





