Delta 1 Brightlab Universal Red Junior Safelight 11 Watt

No. It cannot be used for this purpose. For safe light and total darkness guidelines please click on the link: https://www.kodak.com/uploadedfiles/motion/US_plugins_acrobat_en_motion_products_filter_K4_Safelight_1106.pdf

Yes it is. In fact, I have a very tiny darkroom with safelights that are closer to my enlarger/easel setup than they should be and I still have not had problems with light fogging.

I've ordered these bulbs three times. None have ever been broken. This was the best deal I found. They are used in darkrooms.

It is very red and very dim but if it were me I would contact Harman since they require a very specific red(I think it is a 906?) for their direct positive paper. It sounds like an interesting project.

I replaced a ceiling light bulb with two of these bulbs in my bathroom darkroom, and performed a safelight test, which it passes flawlessly. They do not each put out very much light but with two in the ceiling it is sufficient for my 5ftx10ft space. I would assume that it would be safe at any distance if you chose to put it into a desk lamp for example, but I have not performed a test at that distance.

No. It is ment to be used during printing. Film loads must be in absolute darkness.