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GE-Mazda Photoflood Dark Blue 1000W

GE-Mazda Photoflood Dark Blue 1000W

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This strongly tinted photoflood lamp has a much deeper colour than usual, and was designed for portraiture with black and white film materials. This was found to deliver especially beautiful rendering of skin tones. The original literature claims a colour temperature of 5200K vs the 4800K of normal blue photofloods, however measurement reveals a much higher CCT of 11000K. The measured flux is only 5500lm vs the claimed 9400lm, perhaps due to large variations in the thickness of the hand-blown bulb glass.

The bulb is heavily frosted on its inside surface and delivers a softly diffused light which is easy on the subject's eyes, and does not lead to such severe pupil contraction as other high intensity lamps. It can also be used as a supplementary light source with 'Daylight' film materials, but owing to its unusual spectrum was not recommended as the sole light source - some extra light from standard 4800K photofloods being preferred to attain a more natural colour balance

Aside from the particularly elegant blue glass bulb, the rest of this lamp is similar to standard versions. It employs a single-coil tungsten filament driven at around 3200K, achieving about 300 hours life - considerably longer than the 10 hours of the equivalent 3400K clear and 4800K blue photofloods. The filament is supported on a conventional soft glass stem assembly, and a baffle plate of mica in the neck serves to reduce cap temperature. The mica is of the expanded type, having been treated in a hydrogen furnace to cause partial delamination and improve its infrared reflectivity. The cap is of brass & vitrite, affixed to the bulb with the typical cementless crimping system as found on other GE high wattage mogul screw-based lamps.

MD2040A19.jpg IN_P_GE-Mazda_1000PS52DB-120V.jpg TH_DE_GE_Q500T3CL.jpg IN WC D GE 105-200PS30DAY-E26.jpg

Light Information

Light Information

Manufacturer:General Electric USA
Model Reference:DKE
Lamp
Lamp Type:Incandescent
Filament/Radiator Type:C-7A
Base:E39s/41
Shape/Finish:PS-52
Service Life:300 hours
Electrical
Wattage:1000 Watts (actually measured 1165W)
Voltage:120 Volts
Current:8.33 Amps (actually measured 8.33A)
Optical
Lumen Output:5,500 lm
Lumen Efficacy:4.7 lm/W
Color Temperature:11000 K
Color Rendering Index:Ra 93
Physical/Production
Dimensions:165mm diameter x 332mm length
Factory Location:USA
Fabrication Date:August 1945
Application/Use:Photographic floodlight

File information

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Filename:IN_P_GE-Mazda_1000PS52DB-120V.jpg
Album name:James / Incandescent
Keywords:Lamps
File Size:95 KB
Date added:Nov 30, 2019
Dimensions:1181 x 787 pixels
Displayed:78 times
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migette1
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Peter


migette1
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Nov 30, 2019 at 04:39 AM Author: migette1
Nice lamp and info,thanks James

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

Daniel f
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in my house is not used led and if I can avoid it


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Nov 30, 2019 at 07:45 AM Author: Daniel f
excellent bulb! I like very much . is beautiful . I would like to get a 1000w blue bulb. Congratulations how beautiful!
monkeyface
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Nov 30, 2019 at 09:49 AM Author: monkeyface
Bluetiful!
sox35
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Mainly the electrical side of things


missriaelaine
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Nov 30, 2019 at 10:01 AM Author: sox35
Very impressive, how did you get the additional photos up..?

Ria in Aberdeen
It'll be all right in the end, and if it isn't all right, it isn't the end Smiley

rjluna2
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Robert


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Nov 30, 2019 at 11:03 AM Author: rjluna2
At least you have put up the ANSI information in the Model Reference field

Pretty, please no more Chinese failure.

Max
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Nov 30, 2019 at 11:19 AM Author: Max
This is quite impressive how the measured specs depart from the published ones. As you say, this must come from variations in the bulb thickness and/or composition. Naturally, GE could not adust the filament temperature to compensate for the bulb properties without affecting the lamp life and efficacy in a significant way, which, of course, would have been unacceptable.
socketgeek63
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TheDennisManNetwork photoelectric4863
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Dec 01, 2019 at 09:20 AM Author: socketgeek63
Very beautiful bulb from the Mazda era!

Long live the great old 20th century quality in electrical & lighting products!

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