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Old 2nd August 2017, 12:11 PM
EdmundH EdmundH is offline
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Location: North Norfolk
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Quote:
Originally Posted by CambsIan View Post
Hi Mike,

I use a lamp like that, so your post made me wonder as well.

Had a very quick google, and came up with this.

https://www.amazon.co.uk/THINKMORE-B...ce+halogen+75w

Have no idea if it's any good, may be the wrong colour temp for colour though

This one is similar but cool white, only 4000k so not daylight though

https://www.amazon.co.uk/Aurora-Prem...A34AMN3SJ235OF

Ian

What does anyone think
These bulbs may be usable for black & white, but I am fairly certain that they would cause problems for colour printing due to their uneven spectrum. The attached chart shows how the various light sources differ.

I also notice that the base for the bulbs you've shown is given as GU5.3 whereas the original halogen projector bulbs are GU5.36 - I tried a 2 pin halogen bulb from a domestic fitting in my enlarger a while ago, and although it looked similar, the pin spacing was different.
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