| Manufacturer: | General Electric Company |
| Model: | Lightstream Coloured Sealed Dichroic Halogen lamp. 12V 50W 10° Green |
| Application: | Display, decorative lighting |
| Wattage: | 50W |
| Diameter (max): | 50mm |
| Length: | 46mm |
| Tube Length: | -- |
| Bulb/Tube material: | Outer: Glass, dichroic cold light mirror coating on reflector. Front: green dichroic filter on outside of lens. Inner: Quartz |
| Colour Temperature: | Unknown |
| Peak output wavelength: | N/A - Broadband emission |
| Total light output: | Unknown |
| Rated lifetime: | Not stated |
| Cap: | G5 |
| Operating voltage: | 12V |
| Operating current: | 4A |
| Warmup/restrike time: | None |
| Cost (original): | Unknown |
| Value (now): | -- |
| Place of manufacture: | Great Britain |
| Date of manufacture: | Unknown - Codes M1 and M249 G present on lamp. |
| Current Status: | Working |
Over the last couple of years this style of lamp have started to become increasingly common. There have however started to be an increasing number of cheap imitations too. The better lamps generally employ lamps with a proper dichroic colour filter on the front, and a dichroic cold light mirror on the reflector. The cheaper versions will skimp on one of both of these, often using a simple coloured coating on the lens. The results of this tend to be a lamp which will fade in colour, suffer from the coating flaking off, or in some cases, even the front lens cracking in normal use.
This one however isn't one of the cheap imitations. It's a very nicely finished example of the technology, only slightly let down by the use of a horizontal rather than axial filament (which is slightly misaligned too). So the beam isn't perfect. The metal rim used to hold the front glass into this example is a nice touch and should be far less likely to fail in use than an adhesive. The reflector in this lamp is only partly textured, this helps to keep the beam narrow (just as well given the 10° spec), as you might expect, this introduces a couple of slight artefacts into the beam as mentioned earlier. If the lamp were being used to light a display, this would not be noticeable - however I'd say that it does detract somewhat if it's being used to create something like a colour wash over a white wall or something similar - when the artefacts are more visible.
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - General overview
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - Photograph of beam profile from approximately two metres
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - Detail of rear of reflector and lamp cap
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - Overview of lamp while alight from off-axis, note how light appears blue at this angle due to dichroic coating on the green filter lens
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - Lamp packaging
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - Detail of lamp reflector
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp - Lamp size
General Electric Lightstream 12V 50W 10 Degree Dichroic Coloured Halogen MR16 Lamp Output Spectra
Lamp added to the Virtual Display Shelf on Thursday 22nd December 2005 at 20:22.
References: None.
Acknowledgements: Many thanks to the website reader who donated this lamp!
This page last updated:
17th June 2023: Made some page formatting changes to improve readability on mobile devices and some background page code changes to improve search engine behaviour.
