I beg to differ.
Corporates do not purchase consumer 'printers' with the cost back loaded onto the ink refills, but purchase 'true' cost printers where the consumables are cheaper precisely because they
*do* consider the tocal cost of ownership, and suppliers *are* very well aware of this.tim
We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember "tim....." saying something like:
Who's talking about printers? Different animal entirely.
Home cinema projectors is the same animal though,this is NOT corporate.
You on about these type?
I was referring to the point that corporates don't give a damn about the relative cost of consumables when they choose a product. They do.
tim
Unless you know how to control the risks then even handling this type of bulb is plain stupidity. As Andrew Gabriel pointed out some of these things (but not all) are under considerable pressure even when cold. The risk of them decompressing may be very low but the consequence is very high - should it happen you almost certainly won't be telling the story here.
I work for a major manufacturer of video projectors (not Sony) and have a lot of dealings with lamps of this type. That "easily-changed cartridge" will also be a heat sink and explosion container. That's the manufacturers way of managing the risk during use.
During lamp change you need to manage the risk yourself: ALWAYS make sure the lamp is COLD before starting work. Not been-through-the-cooldown-cycle cold but been-off-for-hours-and-not-even-warm COLD. This both reduces the chances of a decompression and reduces the power should it happen. Read and understand the COSHH sheet for the bulb. If it says to take precautions against explosions it means it. In our lamp room that means chain-mail, full face masks and gauntlets. Should the worst happen, and you survive, don't breathe the dust or attempt to vacuum it up unless your cleaner has a HEPA filter.
Take it from someone who's been next to a lamp when it went bang, the minimum you'll need is a change of underwear.
Unless you know how to control the risks then even handling this type of bulb is plain stupidity. As Andrew Gabriel pointed out some of these things (but not all) are under considerable pressure even when cold. The risk of them decompressing may be very low but the consequence is very high - should it happen you almost certainly won't be telling the story here.
I work for a major manufacturer of video projectors (not Sony) and have a lot of dealings with lamps of this type. That "easily-changed cartridge" will also be a heat sink and explosion container. That's the manufacturers way of managing the risk during use.
During lamp change you need to manage the risk yourself: ALWAYS make sure the lamp is COLD before starting work. Not been-through-the-cooldown-cycle cold but been-off-for-hours-and-not-even-warm COLD. This both reduces the chances of a decompression and reduces the power should it happen. Read and understand the COSHH sheet for the bulb. If it says to take precautions against explosions it means it. In our lamp room that means chain-mail, full face masks and gauntlets. Should the worst happen, and you survive, don't breathe the dust or attempt to vacuum it up unless your cleaner has a HEPA filter.
Take it from someone who's been next to a lamp when it went bang, the minimum you'll need is a change of underwear.
Surely if they were that dangerous, they (a) wouldn't be sold for use in a consumer environment and (b) would not be marketed as user replaceable items? Sure, they can go bang, so can CRTs and to much more dramatic effect. Provided you're not a dick when handling them, and observe the precautions (i.e. be wary of burns etc) then you should be fine, otherwise manufacturers would be opening themselves up to a lot of potentially expensive lawsuits!
Hellraiser..............>
Take it from someone who's been next to a lamp when it went bang, the minimum you'll need is a change of underwear.
Hmmm!
CRTs implode. They have a maximum of 1 atmospheres worth of force on them. High pressure lamps can be hundreds of times more.
The bulbs are not usually sold to consumers.. lamp assemblies are.
If you think a CRT is dramatic, these lamps operate at 200 times higher pressure difference than a CRT. Think bomb...
This is a discussion about using them outside the manufacturer's intended use.
Hellraiser might like to look here:
That said there are often other considerations when changing a lamp in a lamp module, like timers and alignment for instance.
The mere fact that it's EHT circuitry has no bearing on whether it's safe with the power off. To make a judgement on that, you need to know specific details about the circuitry e.g., are there any capacitors holding a charge at high voltage?
MBQ
Small ones, as in domestic projectors - cold, are very unlikely to cause major damage.
You'll almost certainly be around to tell of it, though may have small scars, and at worst one eye. At the bare minimum, I'd wear safety glasses and leather gloves, over a thick jersy.
For commercial lamps - and some are well into the kilowatts, with much higher volumes of compressed gas to explode fragments at you - much more serious protection is needed.
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