Oregon schools, warehouses and businesses will soon be getting a state safety warning about the potential danger of ultraviolet exposure from cracked metal halide lights. State officials said they will also notify the federal government about an unusual but very real danger of severe "sunburn" and irritated eyes that can come from such exposure. The warnings follow a November incident that left about 80 Lake Oswego teachers suffering a range of symptoms after being exposed to ultraviolet radiation from a cracked metal halide bulb burning in a school gym. It was similar to a 2000 incident in which several spectators at a junior high basketball game in Sutherlin suffered from sore eyes and skin rashes that resembled sunburn.An environmental specialist hired by the state estimated that those sitting directly under the cracked light in Lake Oswego would have received a full day's exposure to ultraviolet radiation in just eight minutes.
Metal halide lights are common in large spaces because of the bright, white rays they emit.
But a 1980 federal Food and Drug Administration directive says only metal halide bulbs that self-extinguish when cracked should be used in places where people could be exposed for more than a few minutes, unless other safety precautions are in place.
The FDA also ordered that warnings be placed on the packaging of metal halide lights that don't self-extinguish.
Last week, the Oregon office of the Occupational Safety and Health Administration concluded an investigation that found many school districts and other employers are not aware of the danger of ultraviolet radiation.
The Lake Oswego incident happened when a metal halide light in the Bryant Elementary School gym in Lake Oswego was struck by a volleyball Oct. 18. The district maintenance staff didn't change the bulb because, although cracked, it was still emitting light.
But a four-hour teacher training session in the gym in November left many teachers with symptoms ranging from sensitive skin to burned corneas and temporary blindness.
Teachers union president Kathy Lundeen said although doctors told teachers their symptoms should soon subside, "more than a handful" of teachers are still suffering dry eyes and sensitivity to light more than two months after the incident.
"I don't think anyone should have to go through what the employees have gone through here," Lundeen said.
The day after a February 2000 basketball game at Sutherlin Middle School, school officials received calls from half a dozen people who had attended the game and suffered from burned skin and sore eyes. They later determined that all of those affected had sat in a center court section of the gym, directly below a light that had been struck by a ball.
The light still functioned, but a diffuser that spreads out the light had cracked. As a result, concentrated ultraviolet rays shot downward. The school later replaced the bulbs to ensure that individual lights would go out if their diffusers were damaged.
Dave Bussen, director of environmental health for the Douglas County Health Department, investigated that incident. At the time, he had never seen such a situation.
On Wednesday, Bussen said he would review findings from OSHA and ensure that all Douglas County schools are aware of the potential danger. "We're concerned to hear that this happened again," he said.
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