Re: Metal Halide Arc bulbs for home? Crazy?

Ignoramus4324 <ignoramus4324@xxxxxxxxxxxxxxxxxxx> wrote:

>On Mon, 28 Nov 2005 18:21:41 -0000, Chris Lewis <clewis@xxxxxxxxxxxxxxxxxx> wrote:
>> According to Ignoramus4324 <ignoramus4324@xxxxxxxxxxxxxxxxxxx>:
>>> Thanks. You raised a great issue and I would not want to take any eye
>>> damage risk. Would it make any sense to enclose them into some
>>> appropriate (rated for heat input) glass diffusers of any sort? Glass
>>> is a UV filter, right?
>>
>>> It looks as though going with more regular fluorescents may be more
>>> sensible though.
>>
>> I'd recommend the fluorescents for several reasons entirely aside from
>> potential UV emission.
>>
>> - MH bulbs are _hot_. In a smallish area (a garage would qualify),
>> the directed heat will occasionally be uncomfortable.
>
>Makes sense.
>
>> - MH systems are expensive.
>
>Chris, just what is involved in having a "MH system"?
>
>The lightbulbs seem to just need light sockets. I would suppose tat
>they need robust switches, maybe 0 crossing solid state relays. What
>else is involved, especially with indirect lighting?

They need a ballast (big transformer), and a capacitor. They take
thousands of volts to ignite, and thus require special HV socket and
wiring from ballast to socket. The ballast will require cooling (fan of)
it's own.

A fixture designed for indoor use should have a UV filter option, this
is generally a piece of heat tempered glass.

They will generate more UV than standard lights, so more fabric fading
is common.

It would be far easier to do it with 250 watt/U bulbs, since they are
more common, and work in any position.

For indirect lighting, you can get an outdoor fixture from a box store,
in the smaller sizes, that should work. At least enough to try it out.

.

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