cooling fan on Durst 138?

[ruilourosa]

Led light is a bit cooler... and there are cars and motorcicles without radiators...


My led adaptation works for me, the heatsink reaches 60ºc after 5 minutes on... with a cooling fan...

hope it helps someone else.

[Drew Wiley]

Regardless, cars and motorcycles move themselves thru the air and aren't intended for confined spaces where heat builds up. My own main concern about LED's
is the adolescent stage of the technology - build something today, and matching repair/replacement components might all be different tomorrow. But I commend anyone experimenting.

[ruilourosa]

There are purpose made led light sources for a lot of enlargers...

And most of enlargers do not have fans... Czec Meopta never heard of them... Durst use them just on large format ones, LPL, Leitz, Kaiser, Beseler, Nikkor, Omega ... but i believe they should... my L1200 has one that is not very disturbing but the LAFAN of the cls 300 in my L138 is VERY disturbing and the modification i made to LED lowered power consumption to 10%, heat generation by a huge amout, by tons of decibels noise, so it WORKS...

Another thing... the main issue with fans is that until very recently they had a tendency to vibrate, and that´s not a very interesting quality in an enlarger. Sure you can have a pipe pumping fresh air into the head... and another sucking it out, but most of the time, it´s not needed... the heat it´s not that high, and there is heat shield glass etc... Manufacturers tended to be a lot pragmatic...

And i believe that led is the future of a dead industry

LED produces less heat and more actinic (if needed) light

and LED it´s not that a new technology...

besides: the announced lifespan of the chips is 50.000 hours (i think it will be forever... 50.000x60=3.000.000 minutes let alone tomorrow) and the electronics is as easy as a childs play...

the only thing i would like to improve is start time, although the halogen light that equipped the enlarger had the same or even longer start time i would like to reduce it, but it´s not a LED problem, it´s the Driver... and as it works with 220v to 32v i cannot put the timer between the driver and the led chip...

Just a minor issue, that is fully workable

I think i made a good job, that it works for me, maybe most people do not enjoy a good DIY but i do... and besides... i´m poor

cheers

rui lourosa

[ruilourosa]

About cars and motorcicles... good argument but not easely comparable...



Cheers


rui

[ruilourosa]

Here are some photos...

[ruilourosa]

You can see the heatsink and the chip

the fan is mounted over the hole that i covered with a pipe in a circular manner, it proved enough, as i said after 5 minutes the back of the heatsink is quite cool.

however if the chip fails i can buy another for 1,50€

rui

[analoguey]

Wow! You've used an existing setup to install led inside? Nicely done. Which side are the fans you refer to?

[ruilourosa]

On the left side, in the piping continuum

cheers

rui

[analoguey]

I see. I wondered about the pipe -it seemed to recirculate hot air - the outlet for hot air to escape is elsewhere? (on top, maybe?)

[ruilourosa]

The pipe has holes in the upper part, but i made them just for peace of mind... not needed, even the fan is a plus... makes the chip lasts longer...