Solux DOES NOT MATCH Daylight Color Temperature & CRI is only 95 not 99 as advertized.
See test results below.

Comparison of UltraLux™ Color Balanced Full Spectrum Light to
Solux Halogen bulbs
(Shown at 40% size)
(Shown full size)

UltraLux 55watt Full Spectrum Lamp.

Solux 50watt 4700Kelvin bulb rated at only 3648 Kelvin & only 95CRI

This clearly demonstrates the superior colors of 5500Kelvin natural daylight lamps. Heather is a blonde and is wearing a white hat.

This picture using a halogen tungsten lamp clearly demonstrates the predominate yellow and red colors that do not replicate daylight. Heather is not a Red Head and her Hat is white not yellow.

The UltraLux CFL demonstrates the clear advantage we have over the Solux brand on the right. It is a bright white light that matches the colors of daylight as used in the picture of Heather above.

This Solux halogen 50watt bulb clearly shows the yellow color emitted. Test results below back up the real problems with the Solux bulb.

The Three Main Reasons you should not use Solux for task lighting of any kind.

    • Solux reflector task lamps do not match daylight color and can cause eye strain and could easily damage your eyes
    • Solux lamps use 8 times more energy to operate than low temperature Ultralux lamps and only last 30% as long.
    • Halogen source lights like Solux are dangerous because they cause fires and operate at unsafe temperatures.

    The U.S. Consumer Product Safety Commision has issued warnings to consumers about the dangers of using halogen lights.

    The State of New York Consumer Chief, Secretary of State and the State Fire Administrator urge consumers to AVOID BUYING HALOGEN LAMPS -- SAY LAMPS POSE SERIOUS RISK TO CONSUMERS Release "Put Out the Light" TV PSA

    The Columbia Fire Department, along with the U.S. Consumer Product Safety Commission, announced Tuesday their kickoff of a fire prevention program. Recall Round-Up 2001 is meant to publicize the fact that everyday items can be fire hazards. Richland County fire stations will become drop-off points for unsafe products until April 24. Columbia Fire Chief John Jansen, who spoke at the kickoff at the Laurel Street Fire Station, named several household appliances that can be dangerous.

    “Many products have been determined to be fire hazards — lighters, hair dryers and halogen lamps have been found to be causes of fires,�? Jansen said.

Comparing UltraLux color balanced lamps to Solux halogen bulbs is something we never imagined would be necessary, because halogen lamps have so little to offer when it comes to quality full spectrum lighting, safety and energy savings. The modern development and use of multiple premium phosphors in fluorescent lighting has been considered far superior to halogen lighting for years. With these premium phosphors you can control exactly what type and quality of light you want to produce. Halogen lamps do not offer these same advantages and we will document this below with independent photometric testing from Intertek ETL SEMKO, one of the nation's leading and oldest testing laboratories.

Curtis & Curtis, PC was hired to submit random samples of both UltraLux full spectrum lamps and Solux halogen bulbs to Intertek ETL SEMKO for testing on 5-20-2004. Testing was completed and documented on 6-30-2004. The results not only prove that UltraLux color balanced lighting is far superior, it also proves that the claims Solux makes about its halogen bulbs are misleading.

Full Spectrum lighting
is a term that was coined by John Ott back in 1973. He was the pioneer in full spectrum research and studied the effects of this type of lighting for over 40 years. In his 40 years of research he choose the superior quality of multiple phosphor fluorescent lamps to produce his light sources. In all his years of research he never recommended or used halogen bulbs in any applications. Industry standards for full spectrum lighting are defined as color corrected light that operates in the range of 400 to 800 nanometers. This light will simulate the optical brilliance of outdoor light at noontime, has a CRI of 90 or greater, and a color temp of 5000 to 6500 Kelvin. High lumen output in combination with a large distribution field is also another requirement for proper light therapy. As you can see below, the Solux bulb only meets one of these three important requirements.

Incandescent and halogen sources naturally have high CRI ratings, but they are not color balanced and produce a very high amount of glare due to the small distribution field. These sources operate mainly in the yellow-red spectrum of colors and produce very low levels of blue and green. Solux has a CRI that is greater than 93, but the Kelvin temp is almost 3000 points below daylight reflected light at 6500 Kelvin. Solux knows that higher Kelvin numbers are important and that is why they are claiming that the Model # Q50MR16/CG/47/24 produces 4700 Kelvin, when according to independent test results only produces 3648 Kelvin. This is over 1000 points lower than advertised, almost 1900 points lower than sunlight at noon (5500 Kelvin) and almost 3000 points lower than daylight color lamps. Labeling their halogen bulb as a daylight source of light is misleading when compared to all other daylight lamps (6500 Kelvin) on the market. We have found that their bulb offers little difference to standard or generic brands of halogen lamps on the market.

Of both products tested Ultralux offers many advantages.

  • Wattage used is very similar with UltraLux using 55 watts and Solux using 50 watts.
  • Kelvin Temperature of the UltraLux lamp demonstrates a balanced color spectrum of 5300 Kelvin using three to five Japanese phosphors to produce the highest quality color available in any lamp made today. All lighting experts agree that Japan has long been the leader in mining high quality phosphors. The Kelvin Temperature of the Solux halogen bulb is almost 1900 points below sunlight at noon at only 3648 Kelvin and almost 3000 degrees Kelvin lower than commercially advertised daylight bulbs at 6500 Kelvin. We found that of the three bulbs tested there was only a difference of about 200 degrees Kelvin between them even though Solux rated them at 3500, 4100 and 4700 respectively.

WARNING: Solux advertises their Q50MR16/CG/47/24 bulb at 4700 Kelvin and over 1000 points higher than tested. You decide if that is credible advertising. Normally a margin of error of no more than + or - 2 % is acceptable, not almost 30%.

  • Color Rendering Index is also important and here both Solux and UltraLux meet the requirements of full spectrum lighting specifications. However, it is important to remember that all incandescent lighting has a C.R.I. rating of 100 and they are not considered full spectrum or daylight sources. It must be combined with the correct color temperature as well. Solux also claims everywhere on their site that their lamp has a CRI of 99 when the test results show only 95. This is only two points higher than UltraLux.

  • Average Hours The UltraLux lamp rated at 10,000 hours lasts over three times as long as the Solux halogen bulb rated at 3000 hours and we back it up with a full one year warranty. Why does the Ultralux lamp last longer? The answer is simple. Higher quality construction and lower operating temperature.

  • Average Lumens The Solux halogen bulb only produces 541 Lumens compared to 4300 from UltraLux. The UltraLux lamp is almost eight times more efficient. This is one of the most important factors when trying to bring the benefits of sunlight into your office or home.
  • Lumens Per Watt is a measurement of the bulb's efficiency based on wattage used. Solux operates at a low 11 lumens per watt (LPW), while UltraLux performs at 78 LPW, which is over 700 percent higher than the Solux halogen bulb. It is important to note that all halogen bulbs operate in this range, but the Solux bulb runs even lower than standard halogen bulbs at 19 LPW.
  • Halogen bulbs burn very hot. Solux halogen bulbs operate at a minimum of 395º up to as high as 500º in certain applications. While Ultralux lamps operate 60% to 90% cooler at 182º maximum operating temperature. Many halogen lamps have caused fires because of their high operating temperatures. This should be a major concern when choosing a portable desk or floor lamp for close up work. Working with this type of light for task lighting and light therapy could also damage your eyes because of the high temperatures and small distribution field. While halogen lights offer safe operation in commercial and residential fixtures, they have created problems with many portable lighting devices. 395º is a good temperature for cooking eggs, but will also cook your eyes. Light therapy requires that you sit close to the light source, using a halogen bulb will not work for this application.

    WARNING: Keep all halogen light sources away from flammable products. Click Here and read the articles on the dangers of portable halogen lighting products.

  • Distribution Field Even though Solux claims their lamps are bright enough for light therapy, we need to compare them by the size of the distribution field. The size of the Solux lens is only 1.875" in diameter and the size of the light source is even smaller. What this means is that the Solux lamp is very difficult to look at because the light source is so intense. This is why the larger distribution field of the UltraLux lamp is so critical in task lighting and light therapy. The UltraLux distribution field (39 square inches) is over 34 times larger than the Solux bulb because the inside of the tubes are coated with color balanced illuminated phosphors.

    WARNING: Never stare into a halogen bulb for light therapy or task lighting, it could damage your eyes. There have been other reports warning of the dangers of using Solux bulbs for light therapy. Click Here

    One thing we noted about Solux's claims. They boast that they are the only true daylight source of lighting, but have only self-proclaimed testimony and use graphs that do not support their own claims. They have no independent testing to support their claims about their products. If you will look closely there are dozens of companies that have been marketing full spectrum fluorescent lighting for years. We are one of the leaders in this technology. Not one of these companies sells or promotes halogen lighting as a daylight or full spectrum source. We think if you look closely at the research you will find that there is an abundance of information out there that supports the facts listed below in the comparison chart. Everyone in the lighting industry, with the exception of Solux, states that daylight color temperatures operate in the range of 5000 to 6500 Kelvin. How can one company be right and everyone else wrong? We challenge you to try our products and compare to Solux yourself. There is a vast difference in quality and performance. Come out of the dark ages and see the difference yourself.

    The hands down choice.

    • It would take (8) eight Solux halogen bulbs to produce the same amount of light as one UltraLux lamp.
    • It would take (8) eight Solux halogen bulbs and almost (400) four hundred watts of power for Solux to produce the same amount of light as one UltraLux lamp.
    • It would take over (26) twenty six Solux bulbs to give you the same life at the same amount of light as one Ultralux lamp.
    • Buy the Solux bulb and you would spend $194.60 on light bulbs in addition to $164.00 in electricity usage per year based on average use.
    • Buy the Ultralux lamp and spend $29.50 and $11.20 for electricity per year.

    Read our testimonial section and you will find the truth about how our products have changed the lives of many individuals.

Independent Test Results

Comparison Chart

UltraLux 55watt CFL Lamp
Solux 50watt Halogen bulb
Model numbers UL559155 ** Q50MR16/CG/47/24 **
Watts Used 55 ** 50 **
Kelvin Temperature5260 ** 3648 **
Color Rendering Index(C.R.I.)93**95**
Average Hours10,0003,000
Average Lumen4,300 **541 **
Lumens Per Watt78 **11 **

Operating Temperature

182º **395º **

Distribution Field


** Testing information from