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If you jolt them or turn them off, you have to wait a few seconds before restarting them. I use switch protectors and don't jolt them. Bill Wolk wrote: > > On7/23/99 4:59 PM, Maggie Owens wrote: > > >I don't know much at all (that would be, I really know nothing) about this > >technology, which is why I'm posting this question. (So please be gentle!) > > > >What I am wondering is > >(1) are HID lights really all they are cracked up to be? and > >(2) Is there something about them that makes them *NOT* DIR, and if so, > >what is it and why? > > > >Thanks in advance. > > Maggie - > > My understanding is that the HID lights are arc lights like most stadium > and street lights. That means they don't use a filament that can break > -- but it also means they take a comparatively long time to heat up and > start arcing. (Anyone who's seen street lights or turned on the lights > at a night ball field or tennis court knows what I mean -- first they > start humming and light with a very dim glow, then they get a little > brighter/hotter, then they arc to full intensity.) > > You can see the obvious downside: as long as you never turn your canister > off underwater, you have a bright, electrically efficient light that's > more shock resistant than filament bulbs. If you do switch it off -- > either by accident or on purpose -- you can't switch it back on quickly. > Obviously, with this characteristic, they're not appropriate for > instructing and this could be a problem in an emergency. > > That's all I can think of off the top of my head. I'm curious to see how > they fare in real world use. > > Best regards -- > > Bill -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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