$24.696-pack · from $4.12 per bulb
TJOY 4000K cool white light bulbs
4000K is a neutral white. It has no yellow cast and no blue cast, so it suits places where you work.
- Garages, basements and laundry rooms
- Home offices and craft tables
- Kitchens with white or gray cabinets
4000K on the light color scale
WarmCool
In a bedroom at night it feels like an office. Keep 2700K there.
$7.994-pack · from $1.00 per bulb
$16.996-pack · from $1.92 per bulb
$16.996-pack · from $2.25 per bulb
$36.9912-pack · from $3.08 per bulb
$29.9912-pack · from $2.50 per bulb
$16.994-pack · from $4.25 per bulb
$9.916-pack · from $1.65 per bulb
$35.9912-pack · from $3.00 per bulb
$14.996-pack · from $2.25 per bulb
$14.996-pack · from $2.50 per bulb
4000K or 5000K?
Take 4000K for a neutral white that still feels like indoor light. Take 5000K when you want the look of daylight for detail work.
| 4000K Cool white | 5000K Daylight | |
|---|---|---|
| Look | Neutral white | Blue-white, like noon daylight |
| Best rooms | Office, laundry, kitchen | Workshop, garage, closet |
| TJOY lines | 11 | 19 |
| From, per bulb | $1.00 | $0.87 |
4000K: a common question
Is 4000K cool white or neutral white?
Both names are used for 4000K. On TJOY bulbs it is the white between warm 3000K and daylight 5000K.
For a whiter light, look for products marked 3500-4100K.
ENERGY STAR (U.S. Environmental Protection Agency), Light Fixtures (Downlights), read 3 October 2026