Old 10-11-2010   #41
ath
Registered User
 
ath's Avatar
 
ath is offline
Join Date: Jul 2007
Location: Germany
Posts: 290
Quote:
Originally Posted by PKR View Post
The 60 hertz phase (pulse) rate gives some headaches when reading under CFL lamps.
You shouldn't see a 60 Hertz pulse with CFLs since they work with an electronic "high frequency" (about 100kHz) converter to save weight and space. The traditional FLs with inductive ballast have 60 Hertz.
__________________
Regards,
Andreas
  Reply With Quote

Old 12-05-2018   #42
Pherdinand
the snow must go on
 
Pherdinand's Avatar
 
Pherdinand is offline
Join Date: Jul 2004
Location: by the river called the Gender
Age: 42
Posts: 7,819
Hey - old thread - reviving
Did anyone truy to use a philips HUE or similar color-controllable LED bulb in an enlarger (for variable contrast printing, or even for color printing)?

i think of a test but would not mind reading experiences.
__________________
Happy New Year, Happy New Continent!
eye contact eye
My RFF Foolery
  Reply With Quote

Old 12-05-2018   #43
BillBingham2
Registered User
 
BillBingham2's Avatar
 
BillBingham2 is online now
Join Date: Jun 2005
Location: Ames, Iowa, USA
Posts: 5,891
Haven't but I see several different manufacturer offering different color temperature "bulbs" even some with some level of adjustability via a smart phone.

As LEDs have evolved a LOT over the past 10 years this is a great thread to bring back up.

B2 (;->
  Reply With Quote

Old 12-05-2018   #44
Erik van Straten
Registered User
 
Erik van Straten's Avatar
 
Erik van Straten is offline
Join Date: May 2008
Posts: 8,268
Quote:
Originally Posted by Pherdinand View Post
Hey - old thread - reviving
Did anyone truy to use a philips HUE or similar color-controllable LED bulb in an enlarger (for variable contrast printing, or even for color printing)?

i think of a test but would not mind reading experiences.

I want to do it but I haven't for two reasons: I do not have a HUE lamp (but will try to get one soon) and the enlarging paper is too expensive for extensive testing.


Erik.
  Reply With Quote

Old 12-05-2018   #45
M.Hilo
Registered User
 
M.Hilo is offline
Join Date: Feb 2013
Posts: 87
In one of the other forums, Photrio (Apug before) there's a nice thread last year. Search for Led bulb there.
  Reply With Quote

Old 12-05-2018   #46
leicapixie
Registered User
 
leicapixie is offline
Join Date: Jun 2011
Location: Toronto.Canada
Posts: 1,585
Erik, I used CFL bulb in South Africa, as I couldn't find standard enlarger bulb.
I used Durst 606, reqd. the opal diffuser, due to bulb configuration.
A way brighter bulb without heat..so leaving it on, not a problem..
The red filter OK as safety for loading paper onto easel.
I had to really stop down, to be able to dodge or burn in..
Paper grade was Multi, no filter similar to Grade 2, looked like a beefed up Grade 6!
It was many years ago, now in Canada, enlarger bulbs avaialble but pricey..
The Durst was cool to touch, a new found pleasure..
  Reply With Quote

Old 12-08-2018   #47
Pherdinand
the snow must go on
 
Pherdinand's Avatar
 
Pherdinand is offline
Join Date: Jul 2004
Location: by the river called the Gender
Age: 42
Posts: 7,819
I ment more like: use a real color-tuneable led bulb, turn it red when loading paper, turn it blue for high contrast or green for low contrast on multigrade paper. Combine for split grade. Etcetera.

If i get some old multigrade paper i will just go n try it. No idea about exposure times though)
__________________
Happy New Year, Happy New Continent!
eye contact eye
My RFF Foolery
  Reply With Quote

Old 03-16-2019   #48
Pherdinand
the snow must go on
 
Pherdinand's Avatar
 
Pherdinand is offline
Join Date: Jul 2004
Location: by the river called the Gender
Age: 42
Posts: 7,819
Well i tried it borrowing my wife's 3rd gen hue bulb.
It worked for multigrade contrast changing by changing green to blue.
BUT
Very impractical. If you use an nlarger timer it doesnt work as interrupting the power to the bulb makes it start up bright yellw-white next time, meaning you have to manually time it from on to off on a cell phone.
The app does not have a timer option (not on seconds level anyway), AND even more annoyingly it doesnt always immediately switch off or on when touching the touch button. So its a hit n miss action. Not to mention it is annoying to do it voa a ouchscreen.
Also, the colors do hot have a numeric value attached so everytime it's a guess. It is possible to save color settings for later use-thats about the only advantage.

Finally, the bulb phases out when switching off so for short exp times of a few seconds that means inaccuracy.

If there was a better app, maybe made for this purpose, it could work very well.
__________________
Happy New Year, Happy New Continent!
eye contact eye
My RFF Foolery
  Reply With Quote

Old 03-16-2019   #49
SaveKodak
Registered User
 
SaveKodak is offline
Join Date: Oct 2012
Location: New York City
Posts: 573
Might be an issue in a dichro head but i seriously doubt you'd have any issues in all but the most exotic B&W heads. Plus no film curl in the heat, no adjustments for the age of the bulb, super low energy usage, what's not to like? I thought that Heiland was specifically making an LED head? I would switch to one in a heartbeat.
  Reply With Quote

Old 03-16-2019   #50
SaveKodak
Registered User
 
SaveKodak is offline
Join Date: Oct 2012
Location: New York City
Posts: 573
https://heilandelectronic.de/files/H...ead_Report.pdf

https://heilandelectronic.de/led_kaltlicht/lang:en

The good people at Ilford seem to believe it's a perfectly good way to print B&W photographs...
  Reply With Quote

Old 03-16-2019   #51
Nokton48
Registered User
 
Nokton48's Avatar
 
Nokton48 is offline
Join Date: Dec 2006
Posts: 5,233
modern enlarging systems model 2 by Nokton48, on Flickr


Modern Enlarging Systems Model 2 on DII 1 by Nokton48, on Flickr

LED Printing Baby Yeah!
Modern Enlarging Systems Model 2 LED Enlarging Head on my venerable 4x5 DII

Modern Enlarging Systems Model 2 on DII 2 by Nokton48, on Flickr

LED Printing Baby Yeah!
Modern Enlarging Systems Model 2 LED Enlarging Head on my venerable 4x5 DII

It's quite bright; equivilent to 150W Incandescent; works with VC filters
__________________
“The secret of getting ahead is getting started.”
― Mark Twain
  Reply With Quote

Old 03-16-2019   #52
Doug
Moderator
 
Doug's Avatar
 
Doug is offline
Join Date: Sep 2003
Location: Pacific NW, USA
Posts: 12,986
Pherdinand, thanks for the real-life test, very useful. An interesting concept that didn't quite pan out!
__________________
Doug’s Gallery
RFF on Facebook
  Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 06:16.


vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

All content on this site is Copyright Protected and owned by its respective owner. You may link to content on this site but you may not reproduce any of it in whole or part without written consent from its owner.