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Why plastic refractors aren't a good idea !

Why plastic refractors aren't a good idea !

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This barbecued "thing" is over the door of the complex my dentist is in . It's looked like this for years but still works ! I would assume this has a med. base lamp. The burns are from the light/heat from the arc-tube bouncing off the reflector . I'd guess a coated lamp would have prevented this or at least slowed it down !

DSCN3200.JPG DSCN3091.JPG DSCN3120.JPG DSCN3106.JPG

Light Information

Light Information

Lamp
Lamp Type:HPS
Fixture
Fixture Type:Wall Pack
Location:My dentist's office

File information

File information

Download: Download this File
Filename:DSCN3120.JPG
Album name:wide-lite 1000 / Roaming
Keywords:Lanterns
File Size:489 KB
Date added:Sep 09, 2019
Dimensions:2464 x 1848 pixels
Displayed:125 times
Date Time:2019:09:03 18:08:08
DateTime Original:2019:09:03 18:08:08
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Exposure Time:1/15 sec
FNumber:f 5.5
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ISO:400
Make:NIKON
Model:COOLPIX A300
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Software:COOLPIX A300V1.2
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Fluorescent05
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Sep 10, 2019 at 04:56 AM Author: Fluorescent05
Wow! How many watts is that wallpack?

Don't be fooLED, T8 IS the worst thing to do to a magnetic T12 fixture.

WestinghouseCeramalux
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Sep 10, 2019 at 08:11 AM Author: WestinghouseCeramalux

Wow! How many watts is that wallpack?

100w/S54 and 150W/S55 HPS do this, and do this rather quickly. I personally dislike plastic refractors.

Your mission - should you choose to accept it - is to save unique and rare HID lighting before it's all scrapped.

Lightingguy1994
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Sep 10, 2019 at 11:07 AM Author: Lightingguy1994
A fixture this small with plastic i would use 35w HPS
WestinghouseCeramalux
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Sep 10, 2019 at 02:53 PM Author: WestinghouseCeramalux

A fixture this small with plastic i would use 35w HPS

A 35W lamp wouldn't do this kind of damage. I've seen fixtures like this with up to 150W lamps in them. Someone was being cheap when they bought and installed this piece of junk.

Your mission - should you choose to accept it - is to save unique and rare HID lighting before it's all scrapped.

wide-lite 1000
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Sep 10, 2019 at 03:29 PM Author: wide-lite 1000
Believe it or not , this POS is over 20 yrs old ! It's been there as long as I've been going to this dentist. Does anyone think a coated lamp would have helped to prevent this?

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

Lightingguy1994
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Sep 10, 2019 at 03:50 PM Author: Lightingguy1994

A 35W lamp wouldn't do this kind of damage. I've seen fixtures like this with up to 150W lamps in them. Someone was being cheap when they bought and installed this piece of junk.


A 150w is just too much, but I mean I would put in 35w if i had the same model that was in good shape
wide-lite 1000
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Sep 10, 2019 at 03:54 PM Author: wide-lite 1000
I have no idea what wattage this is . This building looks to be from the 80's .

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

WestinghouseCeramalux
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Sep 10, 2019 at 04:02 PM Author: WestinghouseCeramalux
Looks like a RAB fixture. RAB did indeed make these in up to 150W/S55 HPS.

Your mission - should you choose to accept it - is to save unique and rare HID lighting before it's all scrapped.

WestinghouseCeramalux
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Sep 10, 2019 at 04:04 PM Author: WestinghouseCeramalux

Believe it or not , this POS is over 20 yrs old ! It's been there as long as I've been going to this dentist. Does anyone think a coated lamp would have helped to prevent this?

Watts = heat. A diffuse lamp may have only prolonged the misery. (Just say no to crack. )

Your mission - should you choose to accept it - is to save unique and rare HID lighting before it's all scrapped.

wide-lite 1000
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Sep 10, 2019 at 04:12 PM Author: wide-lite 1000
The whole interior of the building is all LED now so I think this thing's days are numbered anyway ! (Crack kills ! )

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

RyanF40T12
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Sep 10, 2019 at 04:18 PM Author: RyanF40T12
Yup. Rab. We have a number of these at a few church buildings. the 50 and 70 watt ones did ok but 100 watt or higher defeinitly melts the plastic. The plastic is in bad shape regardless after 15 years. I actually still have one of these new in box and have replaced a few ballasts as well over the years.

The more you hate the LED movement, the stronger it becomes.

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Sep 10, 2019 at 06:04 PM Author: Globe Collector
When this was new, the plastic was probably quite transparent so most of the radiant flux from the lamp went through it....however, UV-A from the sun on the outside and the same from the lamp on the inside and the plastic has become crazed and more opaque...thus soaking up more of the radiant flux of the lamp and converting it to heat...this is a case of the WRONG material being chosen for the job in the very first instance at the design stage of the luminaire.....probably deliberately too!


Radiant flux is the sum of ALL the radiation emitted from the lamp, visible or not. (It is measured in watts.)

Luminous Flux is just the visible part of the radiant flux. (It is measured in Lumens.)

Coasted lamp would have made no difference at all because the radiant flux is the same, (the luminous flux might be different though).

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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