Set of four (4) 27W compact fluorescent light bulbs, very bright at 5500K color temperature with 1300 Lumens output. The Joyous Light bulbs are daylight balanced, i.e., their brightness is equal or very close to daylight, which makes them ideal for treating S.A.D. (Seasonal Affective Disorder) a.k.a. ‘Winter Blues.’ Customers praise the bulb’s brightness that makes reading texts easy on the eyes, renders colors of objects accurately for photography, and helps to improve the mood. They are also great as task light or grow light bulbs. Energy Star compliant, flicker-free, CRI of 91, bulb life up to 10,000 hrs. *) Fits all medium-base E27/E26 sockets. Dimensions: L: 6.5″; W (Diameter): 2.5″; Length socket base to top of ballast: 3″; W (diameter) of socket: 1″. A larger lamp harp might be needed to fit this bulb, see ALZO 9″ harp, ASIN B0035LTIZE. Also available as a 15W bulb, see ASIN B0089MIH8I. *) ALZO CFL bulb life is based on the bulb in an open air upright orientation. When ALZO bulbs are installed in fixtures that lack adequate ventilation, the life of the bulb will be reduced. If an ALZO CFL bulb is installed in an overhead recessed light fixture with the bulb glass below the base, the life of the bulb will be greatly reduced. ALZO warranty for all CFL bulbs is 30 days.
Product Features
- Natural daylight balanced color temperature of 5500K
- Mood elevator, ideal for treatment of S.A.D.
- This is a large bulb that might not fit standard household lamps – see diagram above
- 9″ lamp harp will fit this bulb, see ASIN B0035LTIZE
- Energy Star compliant – about 10,000 hrs. bulb life*
Does appear to produce clean white. I don’t have a color meter to measure the output with, but it certainly appears to be a pure white, or close to it. I’m using these for standard lighting rather than photography, but they’ve lasted some months so far with nominal usage. One was DOA, but Amazon was willing to ship me a new 4-pack rather than deal with the hassle of returning the one dead unit.I’m very pleased.
Great light output BUT…. The light bulbs are very good. Plenty of good reading light. They put out a blue-ish white light which creates a nice contrast of the ink on the pages. Delivery was a bit before I expected.
Second time I got these and the second time that I got 1 broken lamp and 1 that won’t turn on. This was in a batch of 16 lamps total.I would like to ask the seller to do a better quality check on these before sending out.Overall I’m satisfied with the light output.