I'm considering using Luxeon (or similar) 1W, 3W, or 5W LEDs to make a light source for a 5x7" enlarger. These apparently produce around 75 lumens per Watt. As generic brand versions are reasonably cheap it may be more affordable (for me) to buy 10 or 20 of these than import a cold cathode source.
Note my reasons for doing this are to reduce heat and for better control as the current light source is not stabilised.
I was specifically thinking of using 10 blue and 10 green, each bank separately dimmable for variable contrast filtering. The wavelength specs for the LEDs are below. (See also http://www.luxeon.com)
- Has anyone built or can anyone see fundamental problems with using high output LEDs for enlarger sources?
- How do I calculate how many I will need? What is typical output level (in lumens or similar) of cold cathode head for 5x7" enlarger?
- Has anyone got plans for building one :-) ?
LUXEON 3 Watt LED Star Modules
*Viewing Angle: 160 degrees
*Wavelength or Colour Temp:
Colour Min. Typ. Max.
Blue 465nm 470nm 475nm
Green 520 nm 530nm 550nm