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Ask the Experts


Is halogen light (provided any UV is filtered out and one can stand the heat) an alternative light generating method for light therapy?

Answered by: Michael Terman

The heat at 10,000 lux would be exceedingly uncomfortable. The bulbs would have to be placed behind a smooth diffusing screen (not directly visible), which would in itself require boosting bulb output further.

Bulb life would be far shorter than with fluorescent sources. Electric power consumption would not be economical.

Finally, infrared emission from these bulbs is very high and poses a risk factor for thermal damage to structures in the eye. This is not a practical or safe solution except for use with low-level dawn simulation.