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Full Spectrum Lighting

ALZO Joyous Light Bulbs are Full Spectrum Lighting Bulbs

POWER 15 watt 27 watt 45 watt 85 watt
INCANDESCENT EQUIVALENT 50 watt 100 watt 160 watt 300 watt
SIZE / FIT ISSUES Small; easy fit for most fixtures Medium; fits many fixtures but may require an upgrade harp for table and floor fixtures Large; does not fit most fixtures and may require an upgrade harp for table and floor fixtures Huge; mostly for industrial applications, or for workspaces in a home


ALZO Joyous Light full spectrum light bulb

ALZO full spectrum light bulbs are sold under the registered trademark brand "Joyous Light".

Full spectrum lighting refers to light or light bulbs that cover the entire electromagnetic spectrum from low infrared to ultraviolet and above. ALZO Joyous Light CFL (Compact Fluorescent Light) bulbs replicate sunlight and are daylight balanced with a color temperature of 5,500 Kelvin, and a CRI (Color Rendering Index) of 91. The light produced by these bulbs is brilliant pure white and renders colors beautifully and accurately. In addition, ALZO Joyous Light bulbs are commonly used for the treatment of SAD or Seasonal Affective Disorder, also known as winter blues.

"The general therapeutic effect of light on seasonal affective disorder (SAD) has been widely acknowledged." (Study titled "Spectral properties of phototherapy for seasonal affective disorder: a meta-analysis" published by Acta Psychiatrica Scandinavica)

ALZO Joyous Light full spectrum light bulbs are available in 4 different intensities: 15 watt, 27 watt, 45 watt and 85 watt. All ALZO bulbs fit common medium-base E26/E27 sockets. These bulbs are larger than standard incandescent light bulbs, and will most likely require larger lamp harps when installed in table lamps and floor fixtures. ALZO offers different sizes of lamp harps.

Advantages of ALZO Joyous Light bulbs:

  • Crisp, bright white light, exceptional reading and task light
  • Chase away the winter blues and improve health and happiness
  • Perfect task work light that improves visual accuracy
  • The Joyous Light has a long bulb life and low energy consumption that saves you money
  • The bulb life is about 10,000 hours
  • Low energy consumption, uses about 1/4 of the energy of a Tungsten light bulb
  • All ALZO Joyous Light bulbs are flicker-free
  • Produces a soft light and minimal heat which reduces cooling costs
  • All 110V bulbs have an operating voltage of 100-120 VAC 60Hz

Seasonal Affective Disorder S.A.D.

ALZO Joyous Light full spectrum lights are commonly used to treat S.A.D., or Seasonal Affective Disorder, aka Winter Blues. S.A.D. is a medical condition created by the lack of light that occurs during winter months, particularly in northern areas. People affected by SAD benefit from the expose to full spectrum lighting on a regular basis, and this is a proven method to help treat S.A.D. The pioneer of research in this field is Dr. Norman Rosenthal, the author of the book "Winter Blues."

Other Applications

ALZO Joyous Light full spectrum lighting is also used for treating skin conditions, agricultural animal housing, and for hydroponic indoor growing applications.

Replacement Harps

If you are installing ALZO full spectrum light bulbs in table or floor lamp, you will most likely need a larger harp as shown here. We sell both 9 inch and 10 inch harps that perfectly fit the 27W and 45W CFL light bulbs.