Dangers of MH bulbs

[joemomma]

Not really too much concern in our industry, since most HID lamps we work on have a protective lens, but there's always the possibility we might find ourselves in this situation.

And of course, Ms. Follette, modern day chicken little, thinks the solution is to recall a product that's been in use for almost 50 years, instead of the simple solution of changing out the bulb when it breaks or putting a retrofit lens over the fixtures that don't already have one. She probably voted for the most famous modern day chicken little, Algore.

MSNBC.com

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Gym light bulbs blamed for burning eyes

Metal halide bulbs, often used in school gyms, may damage corneas

The Associated Press

Updated: 6:01 p.m. ET March 29, 2007

WEST LINN, Ore. - Most people in the Pacific Northwest can hardly wait for the gray winter rains to give way to spring sunshine. But for four teachers from the Portland suburbs, the lengthening days bring only misery, forcing them to stay indoors with the curtains drawn to shield their stinging, sensitive eyes.

The four say their eyes were damaged, perhaps permanently, by ultraviolet radiation from a broken high-intensity light bulb of the sort used in thousands of school gymnasiums, factories, big-box stores and other large spaces all across the country.

At issue are metal halide bulbs, which are about the size of a football and give out bright, white light. The bulbs became available in the 1960s, and millions are in use across the country.

An outer glass envelope normally prevents the release of UV rays. But metal halide bulbs differ from ordinary household bulbs in that when the glass gets broken — say, by a basketball or a volleyball — the inner quartz tube keeps on burning.

Exposure to a broken metal halide bulb can burn the corneas. A small number of cases have been reported across the country and around the world, in Florida and South Dakota, Canada and Australia. Exactly how often it happens is unclear, but some experts suspect many cases go unreported or are mistaken for other conditions, such as pinkeye.

“This is an underappreciated phenomenon,” said Dr. William Schaffner, a professor of preventive medicine at Vanderbilt University, who is an expert in the field and not involved in treating any of the four Oregon teachers. “We are sure there are many more outbreaks than get recognized.”

Declining to regulate

Federal regulators have acknowledged the dangers but declined to regulate the product, suggesting instead that the bulbs be fitted with durable coverings that offer better protection than the wire cages sometimes used in gyms.

In most cases, the pain goes away in a few days after treatment with over-the-counter drugs. But Kellie La Follette, Denise Fletter, Mary Neerhout Borg and Sherry Rhoades say the pain and sensitivity — which make them feel as if they are chopping onions all the time — have persisted for more than two years.

During a nearly six-hour teacher training session at a Lake Oswego elementary school gym in 2004, three of the women were seated directly under a metal halide bulb that had recently been broken by a volleyball, the teachers say. The fourth woman, Rhoades, was a phys ed teacher who spent hours in the gym every day.

By the time the training session was over, some in the room were complaining of sore eyes, headaches and dizziness. On the way home, Fletter rear-ended a car on the freeway. “The brake lights during rush hour were running together,” she said.

La Follette said her eye doctor told her looked like a severe case of snow blindness or welders’ burn, clearly indicating UV damage to the corneas — a diagnosis that ultimately helped pinpoint the broken bulb as the source.

All but La Follette are back at work, but they use eyedrops constantly, wear sunglasses all the time, keep the lights dim and restrict their time outside.

“I have a strong faith in me, but I just don’t know where this will end up,” La Follette said at a recent interview at her home.

The women’s doctors have tried all kinds of remedies, including taping the eyes shut and applying a blood serum to the eyes to stimulate growth, to no avail.

“I am frustrated with the lack of progress we have had,” said their optometrist, Todd Briscoe. “We don’t know how to treat this.”

Lights used worldwide

In February, a broken bulb was discovered in a middle school gymnasium in Haywood County, Tenn., after 40 children complained of burning eyes and skin rashes, said Timothy Jones, a state epidemiologist. All recovered within a few days, he said.

Rob McNealey, a contractor from Aurora, Colo., said he spent 10 hours under a broken metal halide bulb at a trade show in Florida two years ago. He said he now suffers from constant migraines and wears specially made moisture-infused goggles.

“I can’t give up,” McNealey said. “I have little kids. I am 34. I can’t fear the daylight.” But “they just don’t know how to treat it.”

Jean Peterson, an accountant from Aberdeen, S.D., said her eyes still haven’t recovered, a year after she spent eight hours beneath a broken bulb while watching her son’s wrestling match. Snow cover and fireworks make her eyes hurt, she said.

The four Oregon teachers are pushing for a first-of-its-kind state law requiring schools to replace the bulbs with a kind that turns off automatically within 15 minutes after fracturing. Each self-extinguishing bulb costs $12 to $20 more than the standard kind.

The National Electrical Manufacturers Association has come out against the legislation, saying it would require expensive replacements of light fixtures. Instead, NEMA said, lights in school gyms should have protective coverings made of tough, transparent material such as plexiglass.

Similarly, in December, the Food and Drug Administration, which claims regulatory authority over the bulbs through its radiological health arm, recommended the use of self-extinguishing bulbs or the protective coverings.

Sean Boyd, chief of the agency’s electronic products branch, said the FDA has investigated at least one incident a year for the past few years.

The four women are suing Philips Electronics, which manufactured the bulb. A company spokesman denied any responsibility, saying Philips does not recommend using the lights in places where they could get damaged, such as gyms. Other manufacturers include GE and Sylvania.

“These lights are used worldwide, where children go,” La Follette said. “I am completely puzzled as to why there hasn’t been a recall.”

© 2007 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

[joemomma]

Sorry to reply to my own post, ( I got the idea from Ilevel), but I got to thinking about these fixtures, and am stunned that the manufacturer would make them without a protective lens, especially in a gym or other indoor area where lots of people (not just THE CHILDREN!!!) congregate. I'm also amazed that UL would list them. The arc tubes within these bulbs will occasionally explode, breaking the bulb. In a parking lot, all this debris would stay in the fixture. Apparently, UL and the manufacturer are more concerned with tires than tykes.

[YYZ]

I have to agree, Joe. In most cases CSA goes above and beyond UL - so I think Canada does require protective glass or shatterproof plexi lenses. Even halogen lamps require a shield if it's above 100W.

I've had flash burn before - it's not fun - but to be exposed indirectly for 10 hours? Damn.

I could understand places like warehouses or parking lots not requiring as much protection, but codes for public spaces such as schools should have more safeguards - yet it seems UL has it the other way around - though admittedly it sounds more like an NEC problem than a fixture problem. UL can't control where the fixture is ultimately installed... it could be that the contractors met local codes and that was that. If the local codes - generally based on NEC - don't call for guards or covers, then those types of fixtures will be specified.

[joemomma]

"Underwriters Laboratories Inc. (UL) is an independent, not-for-profit product safety certification organization...." (from the UL website). I've worked on a lot of HID fixtures, but never one without a protective lens, either tempered glass or plexiglas. Not just a few times have I seen the bulb shattered inside the fixture. I would think that no matter what the application, safety dictates that, because of the possibility of breakage, all HID fixtures be protected. It's a double whammy when you add to this the dangers of UV rays doing damage to the eyes. I'm really surprised by this.

[Erik Sine]

I have just recently had some personal experience with these thing, man they can be some nasty stuff. Very expensive and for the people who use them to light cabinets, wow!

[geraldi]

We use these all the time in large, lighted signs. Especially flex faces. They are used in high rises and other hard to get to or expensive service places. They have a long life and, if you have 25 to 20 of them in a big sign and a couple go out ,the sign is still in ok shape untill service is done. We put light diffusers around the bulb to avoid hot spots.

I would say the gym took short cuts and didn't use fixtures with shields around them to save $$$. You can get shielded or unshielded fixtures.

[Erik Sine]

Are you talking about High INtensity Discharge lamps? Have ever heard one shatter before, err explode?

[Travis]

I agree, you would think that in a public setting a fixture or explosion proof container would be code.