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Same size LRF/HLRG

Same size LRF/HLRG

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Left: LRF700W made 1987
Right: HLRG400W made 1975
The LRF700W has the same inner structure like a 1969 Philips HPL lamp.

DSC01351lg.jpg DSC01353lg.jpg DSC00958lg.jpg DSC00759lg.jpg

Light Information

Light Information

Manufacturer:Polamp, Philips
Model Reference:LRF,HLRG
Lamp
Lamp Type:MV
Base:E40

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rjluna2
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Robert


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Jul 28, 2020 at 11:49 AM Author: rjluna2
Well, that is certainly an interesting bulb here

Pretty, please no more Chinese failure.

Max
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Jul 28, 2020 at 12:21 PM Author: Max
Nice lamps and nice comparison! The HLRG is really special with its half aluminized bulb.
trojmiejski
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Jul 28, 2020 at 12:28 PM Author: trojmiejski
First Telam lamps were based on Philips designs and the same design was used along the years when the name changed from Telam to Polam and then Polamp.
About the size of LRF 700W it is an interesting thing that in different production years the size of the bulb changed. Most of the time 700W lamps had a bigger bulb unique for this wattage but some from later production in 90's had the same bulb as LRF 400W though the burner was the same as in previous 700 Watters.
At first glance I guess that it is the bigger 700 Watter and the HLRG is oversized for a 400W lamp, not the other way around with undersized 700W. Putting a typical 400W MV lamp aside those here would clarify the situation.
magslight
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Jul 28, 2020 at 12:43 PM Author: magslight
Thanks. Yes , both lamps have the size of a normal 700W MV lamp. Here's exactly the same: http://lamptech.co.uk/Spec%20Sheets/D%20MBR%20Philips%20HLRG400.htm
trojmiejski
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Jul 28, 2020 at 12:47 PM Author: trojmiejski
So everything is as it should be, 1987 was the time when 700 Watters were still made with their native size of the bulb.
rjluna2
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Robert


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Jul 28, 2020 at 12:53 PM Author: rjluna2

At first glance I guess that it is the bigger 700 Watter and the HLRG is oversized for a 400W lamp, not the other way around with undersized 700W. Putting a typical 400W MV lamp aside those here would clarify the situation.

I guess they have oversized envelope and put the arc tube in lower focal point to take advantage lights to reflect to the area

Pretty, please no more Chinese failure.

trojmiejski
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Jul 28, 2020 at 01:02 PM Author: trojmiejski
X-ray in the link nicely shows it. It was just better to be sure thanks to the unique fact that Polamp 700W lamps came in different sizes, something that didn't happened in the 700W lamps made by other manufacturers. If HLRG was next to some other 700W lamp, for example from Philips, then there wouldn't be any worry that something could potentially be amiss.
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