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GS3 to led

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IainB View Drop Down
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Joined: 25 November 2016
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Post Options Post Options   Thanks (1) Thanks(1)   Quote IainB Quote  Post ReplyReply Direct Link To This Post Posted: 17 June 2018 at 10:12pm
Originally posted by 4D 4D wrote:

I am very keen to convert some old studio due mini city to led at present they run a 150watt hmi passive cooling, I was wondering how do you rate the cmy colour mixing using LED in your scans
and what would be the maximum power led one could use in such circumstances.. They get pretty hot after a few hours with the hmi and the thermal cutout is rated at 110c

Im using the following to convert my Clay Paky Mini Scans, this is an area I know very very little around, but Ive had a lot of help over on the Blue Room from someone who has done this before, this may (or may not!) help you 
For the LED im using https://uk.rs-online.com/web/p/cob-leds/1712923/ and the following holder https://uk.rs-online.com/web/p/led-reflectors/1241018/ (which saves soldering onto the COB) and then reusing an old desktop heatsink and fan https://www.ebay.co.uk/itm/HP-DC7700-SFF-Desktop-Cooling-Heatsink-Fan-435265-001-435063-001/171820492521 ;
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Steve20131 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve20131 Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2018 at 5:42pm
Hi,  from experience a 300w cool white will replace the 150w Hti.  In regard to the other comments,  a production led fixture will not replace it on a number of fronts,  in my opinion mainly because the chips will not last long enough for their cost of replacement.  They will always be more to replace,   also they are not as efficient as hti and the half life will always be less than stated in spec sheets usually far less and degradation of the phosphor layer and die is slow and not noticed.  However if you design a proper fixture,  put in the work it will be way better than both.  In this instance also try using a 200w chip first to see if it will do what you need,  a 300 will need approx 8"x8" minimum fan cooled heatsink pref 10".  In my opinion make your own,  it will fit the fixture and cost alot less..




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Steve20131 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve20131 Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2018 at 5:42pm
Incidentally I have to vacate my workshop hence I have to sell everything :o(.   If anyones interested...
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