Bob Hart
October 29th, 2009, 12:17 AM
Following below are some notes I have written for this light kit for which there is currently no available English-Language user-documentation.
I am no lighting technician so my notes below do not assure effective operation of the system or safety for the operator.
Comments and additional information and in particular, safety cautions by lighting guys are therefore sought and will be most welcome.
The comments below are based on my own observations of one of these lamps recently purchased. I have published the notes below for the purpose of prompting purchasers/users to a need to educate themselves in the use and maintenance of all HMI fixtures, not to simply aquire or hire, then plug in and switch on.
I have taken the attitude that not to publish is more neglectful than publishing unauthorised notes which may be incomplete or miss an important detail.
Owners or users of the "Steven Studio" HMI and other lamps imported from China should conduct their own careful researches and observations and develop a best practice based on the best advice.
UNAUTHORISED HANDLING NOTES FOR “STEVEN STUDIO” 1.2K HMI LAMP.
PRODUCT DESCRIPTION.
The unbranded 1.2K HMI Fresnel lamp kit vended by Steven Studio is generally patterned after the style of ARRI and similar HMI lights.
The lamphouse construction consists of two-piece cast aluminium ends, which carry channels into which a combination of aluminium extrusion strips and pressed aluminium sheetmetal as vented side covers, steel sheetmetal internal heatshields and supports, are inserted and secured by machine screws.
Finish is a blue paint coat over the end pieces and silver anodising for the sides with the steel support cradle and base sled finished in black.
The upper front endpiece carries a hinged holder for barndoors and fresnel lens.
The upper rear endpiece is a vented cover which includes a small metal loop for a safety lanyard, chain or cable.
The lower front and rear end pieces support a worm and roller shaft and plain shaft which actuate the spot and flood focus. This functions by moving the lampholder and rear reflector towards or away from the fresnel lens. Both shafts are also the lampholder support.
The lampholder is for the G38 mount type OSRAM 1200W/SE metal halide globe.
Spot and flood adjustment is operated by two knobs, one each at front and rear attached to a common shaft.
Within the lower lamphouse, there is a terminal strip for wiring, integrated with encapsulated circuitry from which the heavy current leads to the lamp emerge. These leads feed through a support panel and heat shield via loose fitting grommets.
On one lower side panel there is fastened a short lead and connector. On the opposite lower side panel is the local on-off switch.
A slotted base panel is retained by overlap of two side covers.
The lower screws which secure these side covers also fasten a steel base frame formed from welded metal rod and flat bar.
Ventilation is by convective airflow.
The lamp is powered by an electronic ballast unit which permits frequency selection for 50Hz, 60Hz and “Flicker free”. There is a red push-button power switch on the front control panel. Also will be found to the left of the push-button is what appears to be a 25A circuit breaker. Circuit breakers are not customarily used as an on-off switch and such use might cause premature failure of the breaker.
The lamp, connecting cord and ballast are contained in a purposed blue panelled industry style transit case of apparent good construction quality and appearance.
WHAT YOU GET.
The lamphouse with barndoors, ballast unit, HMI lamp and supply cable will most likely arrive in the purposed transit case within a tight fitted cardboard box.
The lamp unit includes the support cradle already assembled onto the lamphouse.
A stand must be obtained separately as there is no stand included in the kit.
The components are comprised of :-
Lamphouse including, assembled fresnel lens, support cradle and barndoors frame.
Connecting cable.
Electronic ballast unit including mains supply cable with two-pin connector. (The purchaser must arrange supply and rewiring of a plug suited to the local mains power supply systems.).
To be confirmed - New HMI globe in box. I received an Osram globe in box. (Please do not throw away this box. As the globe should not remain installed in the lamphouse when it is to be shipped over long distances, the box remains the only safe enclosure for shipping the globe.)
ON RECEIPT OF GOODS.
It is recommended that purchasers unpack, then pick up the lamphouse, turn it over several times in several directions and listen carefully for the sound of internal fasteners or fittings which may have come loose during the sometimes violent stresses of shipping.
Then perform a visual inspection. Pay particular attention to the ceramic lampholder, its metal cradle and fasteners, for chips, cracks or excessive looseness.
The ceramic lampholders normally have some looseness between the two clamping components when the globe is not fitted.
There will also be some permitted looseness in the fitment of the sliding lampholder assembly on the rods which carry it.
Check the polished metal reflector. It should be found supported in a cradle of three ceramic hooks. The upper hook may have been sprung in a severe impact and the reflector partially dislodged. Avoid touching the polished metal surface of the reflector as any skin oils will become baked on and create a permanent stain.
Check tightness of all visible external fasteners including the two screws for each of the support claws for the barndoors assembly.
Check the tightness of the rear safety cable loop fastener.
SAFETY PRECAUTIONS WHEN OPERATING.
Do not move the lamp when it is operating.
Allow plenty of time for the globe and the lamphouse itself to cool before moving the lamp or packing it into its transport case.
If the lamp fails, assume always that the globe may explode and wear appropriate personal protective equipment when troubleshooting or changing the globe.
Whilst the venting is louvred, this lamp is not intended to be operated in rain or under water sprays. Fluid spills or droplets might not enter the enclosure directly but may wick in along joints and cause the globe to explode or the ceramic components to crack due to shock cooling.
There is also a risk of lethal electric shock when moisture is involved. Do not assume the heat of the lamp will boil off small amounts of moisture. This may condense elsewhere inside the lamphouse, cause corrosion or conductive carbon tracks across insulation and make the lamp or the ballast fail.
Do not look directly at the operating lamp.
Do not operate the lamp if the fresnel lens door is opened, the fresnel lens is missing or cracked. The globe is a source of potentially harmful ultraviolet radiation. Furthurmore, in this state, there is no protection from debris thrown forward by a globe explosion.
Route the cables systematically and sensibly to avoid tripping hazards or the lamp being pulled to ground.
The lamphouse can become very hot and is a potential burn hazard to unprotected hands or skin. Loose flammable materials should not be directly mounted to the lamp as diffusers.
The lamp should not be placed and operated where flammable materials like curtains or foliage may brush against it.
Because of competitive costs, this lamp may become favored by some small or low-budget independent film makers and purchased outright, rather than rented.
Small or low budget projects often are supported by crew multi-tasking and may be populated by untrained onlookers or keen enthusiasts. All should be discouraged from approaching the lamp to assist move or operate it unless already properly trained in use of HMI lamps.
AUTHOR'S NOTE.
My personal preference for on-set crew maintaining or servicing a HMI lamp, would include use of a full mask capable of protecting head and neck from glass fragments moving at high speed, long sleeved welding gloves for hands. If possible, use a welding apron for protection of chest and abdomen, though for a 1.2K light this might be regarded as over-caution by some.
The lamp should be removed from set for servicing or troubleshooting.
Before the front hinged door is opened for repairs or globe change, the lamp should be positioned to face a natural shield like a wall to prevent any fragments of glass flying freely and injuring anyone else nearby.
I am no lighting technician so my notes below do not assure effective operation of the system or safety for the operator.
Comments and additional information and in particular, safety cautions by lighting guys are therefore sought and will be most welcome.
The comments below are based on my own observations of one of these lamps recently purchased. I have published the notes below for the purpose of prompting purchasers/users to a need to educate themselves in the use and maintenance of all HMI fixtures, not to simply aquire or hire, then plug in and switch on.
I have taken the attitude that not to publish is more neglectful than publishing unauthorised notes which may be incomplete or miss an important detail.
Owners or users of the "Steven Studio" HMI and other lamps imported from China should conduct their own careful researches and observations and develop a best practice based on the best advice.
UNAUTHORISED HANDLING NOTES FOR “STEVEN STUDIO” 1.2K HMI LAMP.
PRODUCT DESCRIPTION.
The unbranded 1.2K HMI Fresnel lamp kit vended by Steven Studio is generally patterned after the style of ARRI and similar HMI lights.
The lamphouse construction consists of two-piece cast aluminium ends, which carry channels into which a combination of aluminium extrusion strips and pressed aluminium sheetmetal as vented side covers, steel sheetmetal internal heatshields and supports, are inserted and secured by machine screws.
Finish is a blue paint coat over the end pieces and silver anodising for the sides with the steel support cradle and base sled finished in black.
The upper front endpiece carries a hinged holder for barndoors and fresnel lens.
The upper rear endpiece is a vented cover which includes a small metal loop for a safety lanyard, chain or cable.
The lower front and rear end pieces support a worm and roller shaft and plain shaft which actuate the spot and flood focus. This functions by moving the lampholder and rear reflector towards or away from the fresnel lens. Both shafts are also the lampholder support.
The lampholder is for the G38 mount type OSRAM 1200W/SE metal halide globe.
Spot and flood adjustment is operated by two knobs, one each at front and rear attached to a common shaft.
Within the lower lamphouse, there is a terminal strip for wiring, integrated with encapsulated circuitry from which the heavy current leads to the lamp emerge. These leads feed through a support panel and heat shield via loose fitting grommets.
On one lower side panel there is fastened a short lead and connector. On the opposite lower side panel is the local on-off switch.
A slotted base panel is retained by overlap of two side covers.
The lower screws which secure these side covers also fasten a steel base frame formed from welded metal rod and flat bar.
Ventilation is by convective airflow.
The lamp is powered by an electronic ballast unit which permits frequency selection for 50Hz, 60Hz and “Flicker free”. There is a red push-button power switch on the front control panel. Also will be found to the left of the push-button is what appears to be a 25A circuit breaker. Circuit breakers are not customarily used as an on-off switch and such use might cause premature failure of the breaker.
The lamp, connecting cord and ballast are contained in a purposed blue panelled industry style transit case of apparent good construction quality and appearance.
WHAT YOU GET.
The lamphouse with barndoors, ballast unit, HMI lamp and supply cable will most likely arrive in the purposed transit case within a tight fitted cardboard box.
The lamp unit includes the support cradle already assembled onto the lamphouse.
A stand must be obtained separately as there is no stand included in the kit.
The components are comprised of :-
Lamphouse including, assembled fresnel lens, support cradle and barndoors frame.
Connecting cable.
Electronic ballast unit including mains supply cable with two-pin connector. (The purchaser must arrange supply and rewiring of a plug suited to the local mains power supply systems.).
To be confirmed - New HMI globe in box. I received an Osram globe in box. (Please do not throw away this box. As the globe should not remain installed in the lamphouse when it is to be shipped over long distances, the box remains the only safe enclosure for shipping the globe.)
ON RECEIPT OF GOODS.
It is recommended that purchasers unpack, then pick up the lamphouse, turn it over several times in several directions and listen carefully for the sound of internal fasteners or fittings which may have come loose during the sometimes violent stresses of shipping.
Then perform a visual inspection. Pay particular attention to the ceramic lampholder, its metal cradle and fasteners, for chips, cracks or excessive looseness.
The ceramic lampholders normally have some looseness between the two clamping components when the globe is not fitted.
There will also be some permitted looseness in the fitment of the sliding lampholder assembly on the rods which carry it.
Check the polished metal reflector. It should be found supported in a cradle of three ceramic hooks. The upper hook may have been sprung in a severe impact and the reflector partially dislodged. Avoid touching the polished metal surface of the reflector as any skin oils will become baked on and create a permanent stain.
Check tightness of all visible external fasteners including the two screws for each of the support claws for the barndoors assembly.
Check the tightness of the rear safety cable loop fastener.
SAFETY PRECAUTIONS WHEN OPERATING.
Do not move the lamp when it is operating.
Allow plenty of time for the globe and the lamphouse itself to cool before moving the lamp or packing it into its transport case.
If the lamp fails, assume always that the globe may explode and wear appropriate personal protective equipment when troubleshooting or changing the globe.
Whilst the venting is louvred, this lamp is not intended to be operated in rain or under water sprays. Fluid spills or droplets might not enter the enclosure directly but may wick in along joints and cause the globe to explode or the ceramic components to crack due to shock cooling.
There is also a risk of lethal electric shock when moisture is involved. Do not assume the heat of the lamp will boil off small amounts of moisture. This may condense elsewhere inside the lamphouse, cause corrosion or conductive carbon tracks across insulation and make the lamp or the ballast fail.
Do not look directly at the operating lamp.
Do not operate the lamp if the fresnel lens door is opened, the fresnel lens is missing or cracked. The globe is a source of potentially harmful ultraviolet radiation. Furthurmore, in this state, there is no protection from debris thrown forward by a globe explosion.
Route the cables systematically and sensibly to avoid tripping hazards or the lamp being pulled to ground.
The lamphouse can become very hot and is a potential burn hazard to unprotected hands or skin. Loose flammable materials should not be directly mounted to the lamp as diffusers.
The lamp should not be placed and operated where flammable materials like curtains or foliage may brush against it.
Because of competitive costs, this lamp may become favored by some small or low-budget independent film makers and purchased outright, rather than rented.
Small or low budget projects often are supported by crew multi-tasking and may be populated by untrained onlookers or keen enthusiasts. All should be discouraged from approaching the lamp to assist move or operate it unless already properly trained in use of HMI lamps.
AUTHOR'S NOTE.
My personal preference for on-set crew maintaining or servicing a HMI lamp, would include use of a full mask capable of protecting head and neck from glass fragments moving at high speed, long sleeved welding gloves for hands. If possible, use a welding apron for protection of chest and abdomen, though for a 1.2K light this might be regarded as over-caution by some.
The lamp should be removed from set for servicing or troubleshooting.
Before the front hinged door is opened for repairs or globe change, the lamp should be positioned to face a natural shield like a wall to prevent any fragments of glass flying freely and injuring anyone else nearby.