plastic reflector in combination with 25W bulb?
plastic reflector in combination with 25W bulb?
(OP)
I've been given the task of trying to fit an existing lamp into an existing component. I have been told to just make it fit, meaning that I may modify component carriers which were previously sacred. Now that it seems I have found a solution for the bulb (and socket) to fit there is the problem of designing a reflector. There isn't much space available, so it isn't unlikely that the bulb would come in direct contact with the reflector. Additionally, the space available might not allow the use of a simple design (the reflector originally used with the lamp I'm designing for was basically a U-shaped metal piece), which is why I'm considering a plastic reflector.
So, would a plastic reflector work with my requirements (25W bulb, probably in direct contact, active in periods of 10-15 minutes if we're unfortunate)?
(oh yeah, it's for use as an external lightsource for household refrigerators and freezers, if that information is of any help)
So, would a plastic reflector work with my requirements (25W bulb, probably in direct contact, active in periods of 10-15 minutes if we're unfortunate)?
(oh yeah, it's for use as an external lightsource for household refrigerators and freezers, if that information is of any help)





RE: plastic reflector in combination with 25W bulb?
A critical question is what temperature is it likely to see.
A suggested material based on the very little necessary information provided would be white coloured glass filled PET or chrome plated PC/ABS alloy.
If you can avoid direct contact by even a mm or two the job will be a lot easier.
Regards
eng-tips, by professional engineers for professional engineers
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RE: plastic reflector in combination with 25W bulb?
I think that car headlight reflectors (halogen/xenon discharge) are made from plated PPS.
As Pat suggested, a lot depends on bulb temperature.
Cheers
Harry
RE: plastic reflector in combination with 25W bulb?
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: plastic reflector in combination with 25W bulb?
Or polyarylamide:
http://tinyurl.com/6gtb5h
Cheers
Harry
RE: plastic reflector in combination with 25W bulb?
The OP does not state whether he requires an accurately focused reflector or just more light going in the genera direction of in front of the light. This will impact on required dimensional stability and colour and surface finish and scope to design reflector shape for focus or for clearance on the bulb.
We need a some more info from the OP to give good advice, especially temperature reached and quality of light beam required.
Regards
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RE: plastic reflector in combination with 25W bulb?
The typical appliance is about 175 cm from floor to lamp. It is 60cm wide and the lamp is 15 cm from the right-hand side (as seen from the front of the appliance).
The temperature reached is a bit uncertain, but I'll check with our laboratory staff to see if they have any information.
RE: plastic reflector in combination with 25W bulb?
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: plastic reflector in combination with 25W bulb?
RE: plastic reflector in combination with 25W bulb?
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.