What this safelight is, and what it isn't
The Delta 1 Brightlab Universal Red Jumbo is a screw-in bulb safelight intended for contact and enlarging papers. It fits any standard household 110V lamp. That's the full scope of what the supplied product record confirms. It does not specify a safe distance from the paper, a maximum exposure time under safelight, or a list of compatible paper brands.
That matters because a safelight is not a guarantee. Whether a given paper stays fog-free under a given bulb depends on the paper, the distance, the bulb's output, and how long the paper sits out. The Brightlab gives you the light source; your fog test tells you whether your setup is actually safe.
The catalog facts that shape your setup
- Delta 1 Brightlab Universal Red Jumbo Safelight 25 Watt: Screw-in bulb safelight for contact and enlarging papers. This tells you the intended job: black-and-white paper handling, not film loading or color work.
Delta 1 Brightlab Universal Red Jumbo Safelight 25 Watt - Delta 1 Brightlab Universal Red Jumbo Safelight 25 Watt: Fits any standard household 110V lamp. Check your lamp socket and supply voltage before buying. A standard household 110V fixture is the confirmed fit.
- Delta 1 Brightlab Universal Red Jumbo Safelight 25 Watt: 25 watt bulb. Wattage is the only output figure the record gives. Use it as your starting point and let the fog test, not the number, decide your distance.
A safe first setup, step by step
Work in this order so you never trust an untested safelight with a real print.
- Confirm the fixture: The bulb fits any standard household 110V lamp. Check that your safelight fixture takes a screw-in bulb and is rated for a 25W load. If your fixture is not a standard 110V household lamp, the supplied record does not confirm fit.
- Mount it away from the enlarger and trays: Place the lamp so it lights the work area without shining directly into open paper or the enlarger lens. The record gives no recommended distance, so treat placement as something you verify rather than assume.
- Run a fog test before your first real print: With the safelight on and the enlarger off, expose a strip of your paper to the safelight for the length of a typical printing session. Develop it alongside a completely unexposed control strip. If the test strip shows any density the control does not, move the safelight farther away or shorten your paper's time out, then retest.
- Keep the test strip as your reference: Label it with the date, paper, and safelight position. If you change paper, bulb, or lamp position, run a new test. A passing test only covers the conditions you tested.
Checkpoints worth keeping
These are the points the supplied evidence actually supports. Everything beyond them is your own testing.
- Voltage and socket: Standard household 110V lamp fit is confirmed. Anything else is unverified.
- Wattage: The bulb is 25W. Don't substitute a higher-wattage bulb in a fixture that isn't rated for it.
- Paper type: The record names contact and enlarging papers, not specific brands. Test the paper you actually use.
- Session length: No maximum safelight exposure time is supplied. Your fog test should cover a realistic session, not a quick check.
Where the supplied record stops
The catalog does not give a recommended safelight distance, a maximum safe exposure time, a list of compatible papers, or operating instructions. That is not a flaw in the product; it is the limit of what the record confirms. Treat the fog test as your source of truth for your own darkroom.
If you need a figure the record doesn't provide, test it yourself under your actual conditions. A safelight that passes your test at your distance with your paper is a safelight you can trust.
