Anybody interested in one of these reflectors? - Page 2

TaskMaster · 11th January 2005, 04:12 PM

Sorry - brain cramp there. I was thinking mm.

Guy Grotke · 11th January 2005, 10:00 PM

The center of curvature on the 12 cm diameter mold is right in line with the rim, but the top inch of it is a bit straighter than the nice smooth curve of the rest. But you don't need that part of it in your reflector anyway. I cut the top inch off, but left a small tab remaining on each side for mounting.

With the one inch removed, it fits my Ushio retrofit bulb perfectly. These bulbs are T15, so they are 15/8" in diameter. Half that is 15/16", so it is mounted 1/16" above the rim of the reflector.

I think it is important to cut most of that top inch away, instead of just making a small cutout for the bulb on one side. This way I get lots of cooling air flowing around all sides of the bulb, instead of making a little oven for it to sit in.

Guy Grotke · 11th January 2005, 11:21 PM

Here are a couple of pictures.

First is a closeup of the quiche mold reflector.

Guy Grotke · 11th January 2005, 11:24 PM

This is the cut & silver plated quiche mold next to a stainless steel soup ladle for comparison. Note the difference in the brightness of stainless versus silver!

TaskMaster · 11th January 2005, 11:59 PM

Very nice! Just out of curiosity, how much did you pay to plate it? Did you then use that 100x200mm condensor?

Guy Grotke · 12th January 2005, 11:49 AM

This was the very last thing I needed to get my PJ together, so I confess I ran out of patience and went to a local plater well known for being overpriced. So I paid $48 US and picked it up the next day. They actually would have done in in just a few hours for that price, but I live about 50 miles away and couldn't wait around.

I found other platers on the web who have a $28 charge for something that size. And of course, the price for some quantity of them would drop.

Another option for plating a bunch of them would be to setup a plating operation: Some of the latest plating solutions are non-toxic and suitable for home use.

I had to give up using the condensor lens for now. My hot mirror mounting doesn't let me get it close enough to my 2" diameter lamp arc. But I really do like the results. And tests with the reflector covered show that it makes the image much brighter.

Even if you just leave it stainless steel, it has a better size and shape than most soup ladels.

jrhilton · 13th February 2005, 04:21 PM

It's been a few months since anyone posted something to this page, I was wondering, CarlofE / Guy Grotke , are you both still using the reflector that you described on this page, one of you said you had it silver plated, are there any signs of the silver tarnishing yet due to the heat from the bulb? CarlofE has yours trrnished yet, or is it still nice and shiny?

Does it still work well, it seems a good option for a 400w MH bulb and 15" screen.

Anyone any opinions who has used this reflector.

Thanks.

James

Guy Grotke · 13th February 2005, 07:53 PM

I've only been using it for a couple of months, but I have not seen any tarnishing yet. Ask me again in a year!

jrhilton · 13th February 2005, 10:09 PM

Many thanks for the info...........seems like my quest for a good reflector is over (hopefully).

James

snortonnorton · 31st December 2005, 08:07 PM

yeah, why silver plate it when you could chrome plate it and it would never tarnish?

11th January 2005, 10:00 PM	#12
Guy Grotke diyAudio Member Join Date: Sep 2004 Location: Vista, CA	quiche mold hemisphere The center of curvature on the 12 cm diameter mold is right in line with the rim, but the top inch of it is a bit straighter than the nice smooth curve of the rest. But you don't need that part of it in your reflector anyway. I cut the top inch off, but left a small tab remaining on each side for mounting. With the one inch removed, it fits my Ushio retrofit bulb perfectly. These bulbs are T15, so they are 15/8" in diameter. Half that is 15/16", so it is mounted 1/16" above the rim of the reflector. I think it is important to cut most of that top inch away, instead of just making a small cutout for the bulb on one side. This way I get lots of cooling air flowing around all sides of the bulb, instead of making a little oven for it to sit in.

12th January 2005, 11:49 AM	#16
Guy Grotke diyAudio Member Join Date: Sep 2004 Location: Vista, CA	reflector This was the very last thing I needed to get my PJ together, so I confess I ran out of patience and went to a local plater well known for being overpriced. So I paid $48 US and picked it up the next day. They actually would have done in in just a few hours for that price, but I live about 50 miles away and couldn't wait around. I found other platers on the web who have a $28 charge for something that size. And of course, the price for some quantity of them would drop. Another option for plating a bunch of them would be to setup a plating operation: Some of the latest plating solutions are non-toxic and suitable for home use. I had to give up using the condensor lens for now. My hot mirror mounting doesn't let me get it close enough to my 2" diameter lamp arc. But I really do like the results. And tests with the reflector covered show that it makes the image much brighter. Even if you just leave it stainless steel, it has a better size and shape than most soup ladels.

13th February 2005, 04:21 PM	#17
jrhilton diyAudio Member Join Date: Jan 2003 Location: UK	Reflector still working? It's been a few months since anyone posted something to this page, I was wondering, CarlofE / Guy Grotke , are you both still using the reflector that you described on this page, one of you said you had it silver plated, are there any signs of the silver tarnishing yet due to the heat from the bulb? CarlofE has yours trrnished yet, or is it still nice and shiny? Does it still work well, it seems a good option for a 400w MH bulb and 15" screen. Anyone any opinions who has used this reflector. Thanks. James

13th February 2005, 07:53 PM	#18
Guy Grotke diyAudio Member Join Date: Sep 2004 Location: Vista, CA	silver plating I've only been using it for a couple of months, but I have not seen any tarnishing yet. Ask me again in a year!

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11th January 2005, 04:12 PM	#11
TaskMaster diyAudio Member Join Date: Jan 2005 Location: USA	Sorry - brain cramp there. I was thinking mm.

11th January 2005, 11:59 PM	#15
TaskMaster diyAudio Member Join Date: Jan 2005 Location: USA	Very nice! Just out of curiosity, how much did you pay to plate it? Did you then use that 100x200mm condensor?

13th February 2005, 10:09 PM	#19
jrhilton diyAudio Member Join Date: Jan 2003 Location: UK	Many thanks for the info...........seems like my quest for a good reflector is over (hopefully). James

31st December 2005, 08:07 PM	#20
snortonnorton diyAudio Member Join Date: Dec 2005 Location: tallahassee	yeah, why silver plate it when you could chrome plate it and it would never tarnish?

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