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Description
Philips 21-Watt 34 in. Linear T5 Fluorescent Tube Light Bulb Cool White (4100K) Alto (40-Pack)Philips linear fluorescent 21 Watt 34 in. T5 cool white light bulb (F21T5 841) is ideal for residential use in garages workshops, basements, as well as for commercial use in general, decorative and architectural lighting. It provides a cool white light. Brightness: 1950 lumens Estimated yearly energy cost: $2. 89 (based on 3 hrs day, 11c kWh. Costs depend on rates and use.) Life: 22. 8 years (based on 3 hrs day) Light appearance: 4100K (Cool White)
Philips linear fluorescent 21-Watt 34 in. T5 cool white light bulb (F21T5/841) is ideal for residential use in garages workshops, basements, as well as for commercial use in general, decorative and architectural lighting. It provides a cool white light.
- Brightness: 1950 lumens
- Estimated yearly energy cost: $2.89 (based on 3 hrs/day, 11c/kWh. Costs depend on rates and use.)
- Life: 22.8 years (based on 3 hrs/day)
- Light appearance: 4100K (Cool White)
- Energy used: 21 Watts
- Lumens per watt: 95.24
- Ideal for residential use in offices, as well as for commercial use in general, decorative and architectural lighting
- Great for general purpose lighting - creates a balanced and pleasant light
- Contains mercury: yes (for more on clean-up and safe disposal, visit: epa.gov/cfl)
- Contains mercury: yes (for more on ceal-up and save disposal visit: www.epa.gov)
Features
| Light Bulb Base Type | Bi-Pin |
| Actual Color Temperature (K) | 4100 |
| Indoor/Outdoor | Indoor |
| Returnable | 180-Day |
| Light Bulb Base Code | G5 |
| Color Rendering Index (CRI) | 85 |
| Average Life (hours) | 25000 |
| Lumens (Brightness) | 2000 |
| Bulb Type | General Purpose |
| Wattage (Watts) | 21 |
| Color Temperature | Cool White |
| Number of Bulbs Included | 40 |
| Light Bulb Features | No additional features |
| Light Bulb Shape Code | T5 |
| Lighting Technology | Fluorescent |
| Bulb Shape | Linear |
| Bulb Construction | Glass |
| Bulb Diameter (In.) | 0.625 |
| Product Length (in.) | 34 |
| Approximate Light Bulb Length | 3 ft. |
| Manufacturer Warranty | Yes. Please see the "more information" tab for details |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 861 reviews
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Product Reviews
★★★★★ 5
Works great on bullet coffee!!
Color: Lux Alpha Black, Size: Rechargeable Z1 Motor Max
I am really pleased with this frother! Frothers I have used in the past didn’t mix my decaf coffee, 2% milk, and MCT oil as thoroughly as I like (oil and coffee separated). This frother blends everything AND I get a nice layer of frothy milk on top!!! Charge lasts a long and the froth can be submerged all the way up to the button!!!
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Reviewed in the United States on June 5, 2026
★★★★★ 5
Perfect for Lattes
Size: 20 Ounces
Good for steaming 8-10 oz of milk. The nifty tool is good for scooping out your puck.
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Reviewed in the United States on February 19, 2026
★★★★★ 5
Almost blew up my microwave
Size: 20 Ounces, Size: 20 Ounces
TL;DR "A hilarious microwave mistake turned into a great home cafe upgrade. This 20oz cup is straightforward to handle, looks incredibly professional, and holds a level of heat that will literally burn you if you aren't careful."
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Bought this for homemade coffee brewing, just to spice things up. But as I go ahead to heat up my new shiny stainless steel milk frother cup in the microwave, whoopdy doo. Ya can’t put stainless in the microwave! Regardless, it’s still a straightforward frother cup to handle, making it a great dollar investment for upgrading my home cafe setup.
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1. Spotless Stainless Steel: Its sleek appearance made me feel professional in the hands of an amateur like moi. Great quality!
2. Temperature Retention: I accidentally burnt myself because it stayed so hot, but that is a major positive. Proving the insulation works perfectly and keeps the milk piping hot.
3. Size: The 20oz capacity is accurate, providing the perfect amount of space for frothing without any overflow.
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Reviewed in the United States on June 6, 2026
★★★★★ 5
Sturdy
Size: 20 Ounces
Great pitcher
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Reviewed in the United States on January 20, 2026
★★★★★ 4
Decent pitcher
Size: 11.8 Ounces
Smaller than expected. I frothed 5 oz of milk and it was almost a mess.
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Reviewed in the United States on October 16, 2025