email@example.com (Chris Lewis) wrote in
One other note;I worked in a lab with MH lighting,and any brief power
interruption meant we went without light for the time it takes for them to
cool and then re-ignite,about 15 minutes,IIRC. A PITA.
Our lights had UV filters,and reflected off the white ceiling.
I would not want them in my home.
Glass _can_ be a UV filter if it's coated with the appropriate material.
Some plastics are UV absorbant but even they need special treatment to
make them highly UV absorbant. Polycarbonate, for example, will block
UV, but if you want PC that is rated for eye protection against UV, you
look for UV400 polycarbonate.
How are you going to get this single bulb to distribute the light evenly
in a garage?
Any old glass, polycarbonate and the common acrylic sheets are plenty
good for protection from shortwave UV and UVB from a broken bulb. The UVA
that gets through these materials will be less than that in a similar
quantity of daylight. Metal halide lamps designed for illumination are
actually not that efficient at producing UV - they are somewhat good at
specializing in producing visible light.
The special materials mentioned by Michael Daly are only needed when
you need a degree of UV removal much more severe than merely having a fair
amount less UV than is present in a similar quantity of sunlight that has
gone through window glass.
- Don Klipstein ( firstname.lastname@example.org)
I believe the degree of eye damage was overblown. If the bulb has just
a crack, not much nasty UV gets out. And the way I hear it, eye
irritation from shortwave UV and UVB is generally recoverable.
But if the bulbs are in an enclosed fixture, then the fixture covering
stops any nast UV that gets out of the bulb.
- Don Klipstein ( email@example.com)
"Essentially, I would not mind a visit from the cops all that much, I
have nothing serious to hide. I cannot see, though, why they would
decide to visit, but that's all beside the point. "
Homes with abnormally large heat blooms in the structure, or on the
power pole (transformer) are a signature of someone using lots of
lights (often MHAs!) to grow marijuana.
I think that as a law abiding citizen in a country under the rule of
law, it is not a good reason to avoid lawful activity just because it
has a heat signature similar to unlawful activity.
Worst case is, I get a visit from law enforcement, and if they have a
search warrant, I would gladly show them my MH lighting.
If they do not have a search warrant, I would tell them that I use MH
lighting in my garage, and politely tell them to get a search warrant
to enter my house.
If burglars break into my house at night, I will shoot to stop.
Besides, that ligting will see intermittent use, only when I am
actually working in a garage. It is unlikely to be running at all
hours of the day. So, I question the premise that use of MH lighting
for illuminating a garage, would truly arouse suspicions any more
than, say, use of 1 kW spotlights such a the one I have.
There could be good reasons to avoid MH lighting such as
- eye safety
- fire safety
etc. Visits from cops are not a good enough reason.
Ig, I agree 100%, just thought you'd like to know *why* the other
poster was suggesting you'd get a knock on the door (or why someone
might be taking out the hinges with a few well-placed shotgun
Yes, I definitely appreciate your thought. It is helpful.
I also learned that these lights are used for fishtanks.
I would love to have a flood of something similar to sunlight in my
garage. That would be most excellent, if it can be done safely and
I would just laugh if they showed up at my home and invite them in.
I figure if they are there the bad guys are going to be somewhere else.
Besides I think most of the already know me from seeing me running. I live
in a small town.
I have a very similar lamp that I've experimented with in my basement.
I don't recall the exact lamp number.
The 3000k coated lamps are much more pleasant light to look at than
similar 4200k lamps with the clear envelope, and they don't fade the
furniture as much. But my fixture has trouble starting this lamp -- the
old wornout clear lamp still starts just fine.
The "furniture" in my garage would not display any sign of fading, due
to heavy coat of dust. :)
Now, do you actually like the light produced by your MH lighting
system? Is it pleasant? Do you also use a 400W bulb and, if so, how
large is your area? How tall is the ceiling etc
I would suggest fluorescent lights, the 8 foot jobs (maybe one of them
that use two pair or four foot lamps) get the high efficiency ones and make
sure they are rated for cold temperatures (unless you live in a very warm
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