reubeni
02-25-2007, 01:27 PM
Known for some time now that overexposure to HID lighting is not good
have a peruse below and treat them with caution.
Low-pressure discharge lamps.
Low-pressure discharge
lamps do not normally present a retinal hazard,
because of the relatively low radiance. Only lamps
with quartz envelopes can transmit sufficient UV-B
and UV-C to be of concern. Of the common low-pressure
lamps, only mercury lamps can create a severe UVR
hazard. Many may be quite hot to the touch.
Fluorescent lamps.
Low-pressure tubular lamps in
almost all cases have a thin glass envelope, but
could often present a potential UVR hazard at the
surface. They do not represent a thermal retinal
injury hazard and seldom a blue-light hazard.
HID lamps.
These lamps may present both blue-light
and thermal retinal hazards, and possible UVR
hazards. Since most lamp envelopes are glass, there
is little UV-B leakage. Nevertheless, the UV-B
leakage may be of concern at very short distances.
Quartz-mercury HID lamps require a UVR risk
evaluation. If the outer glass envelope of an HID
lamp breaks, hazardous UV levels will be emitted.
Governmental regulations in Canada and the USA
require HID lamps to have a self-extinguishing
feature to preclude this hazard, unless the packaging
clearly warns against use without adequate shielding.
Hazards Hids fall into this category.
Safety Group 3: Moderate-risk sources.
These lamps would be unsafe to view at close range, even momentarily.
Presumably, skin injury could also occur from ultraviolet
radiation as from germicidal lamps, sun lamps, and high
intensity UV-A lamps. A danger-label, clearly visible on
the equipment, could be required. A common lamp that might
fit into this category would be a 600-1000-W tungsten-
halogen lamp without a Fresnel lens, such as is used for a
home cine film spot lamp. The emergent beam irradiance is
far in excess of that required to ignite paper within half
a metre of the source. Obviously, the basis for the
determination of a hazard classification would differ
according to whether the hazard classification criteria
were based on retinal or skin injury. Each measurement for
classification would be for a specified accessible
approach distance, using a standard aperture and solid
angle of acceptance. The minimum approach distance could
vary with application. Other examples that might be
included in this category are some very high intensity,
short-pulse, laser flash tubes, and 20 kW xenon-arc
searchlights.
So when in the grow room wear sunglasses like the urban grower
no exposed skin or smother in high factor sun block and don't go to sleep in the grow room spend as little time as possible in there.
have a peruse below and treat them with caution.
Low-pressure discharge lamps.
Low-pressure discharge
lamps do not normally present a retinal hazard,
because of the relatively low radiance. Only lamps
with quartz envelopes can transmit sufficient UV-B
and UV-C to be of concern. Of the common low-pressure
lamps, only mercury lamps can create a severe UVR
hazard. Many may be quite hot to the touch.
Fluorescent lamps.
Low-pressure tubular lamps in
almost all cases have a thin glass envelope, but
could often present a potential UVR hazard at the
surface. They do not represent a thermal retinal
injury hazard and seldom a blue-light hazard.
HID lamps.
These lamps may present both blue-light
and thermal retinal hazards, and possible UVR
hazards. Since most lamp envelopes are glass, there
is little UV-B leakage. Nevertheless, the UV-B
leakage may be of concern at very short distances.
Quartz-mercury HID lamps require a UVR risk
evaluation. If the outer glass envelope of an HID
lamp breaks, hazardous UV levels will be emitted.
Governmental regulations in Canada and the USA
require HID lamps to have a self-extinguishing
feature to preclude this hazard, unless the packaging
clearly warns against use without adequate shielding.
Hazards Hids fall into this category.
Safety Group 3: Moderate-risk sources.
These lamps would be unsafe to view at close range, even momentarily.
Presumably, skin injury could also occur from ultraviolet
radiation as from germicidal lamps, sun lamps, and high
intensity UV-A lamps. A danger-label, clearly visible on
the equipment, could be required. A common lamp that might
fit into this category would be a 600-1000-W tungsten-
halogen lamp without a Fresnel lens, such as is used for a
home cine film spot lamp. The emergent beam irradiance is
far in excess of that required to ignite paper within half
a metre of the source. Obviously, the basis for the
determination of a hazard classification would differ
according to whether the hazard classification criteria
were based on retinal or skin injury. Each measurement for
classification would be for a specified accessible
approach distance, using a standard aperture and solid
angle of acceptance. The minimum approach distance could
vary with application. Other examples that might be
included in this category are some very high intensity,
short-pulse, laser flash tubes, and 20 kW xenon-arc
searchlights.
So when in the grow room wear sunglasses like the urban grower
no exposed skin or smother in high factor sun block and don't go to sleep in the grow room spend as little time as possible in there.