LED enlarger light

[Curt]

Does anyone here have one if these, specifically a 5x7, but any other is fine.

http://www.rhdesigns.co.uk/darkroom/html/led_light_source.html

[Sal Santamaura]

See my posts #5 and #14 in this thread:


http://www.largeformatphotography.info/forum/showthread.php?96198-LEDs-for-enlarger-light-source

[Arne Croell]

Does anyone here have one if these, specifically a 5x7, but any other is fine.

http://www.rhdesigns.co.uk/darkroom/html/led_light_source.html

Yes, I have a 5x7 unit for a Zone VI enlarger. I also own the short-lived 4x5" Calumet LED head for the Zone VI, which uses high-intensity LED's (and a fan) but not as many as the Heiland. The illumination of both is very even. The red LED's in the Heiland (Calumet only used blue and green) are helpful.
Initially, the (fixed) light output of the Heiland was actually too bright for me, I had to use f/16 or f/22 to get exposure times in the usual range of 10-20s, whereas the Zone VI allows fine tuning of the intensity in 99 steps for each color. Mr. Heiland later built an additional part to cut the intensity down to 1/2 or 1/4, which was quite helpful. The Heiland is built like a tank, btw.