Black Light Bulbs: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
Claude and GPT choose the same brand, Feit Electric
In Tools & Home Improvement, Claude and GPT choose the same brand in 24 of 53 categories.
Claude Opus 5.5 · October 28, 2026
Feit Electric (brand)
Feit sells widely available screw-in black light bulbs that fit standard lamps for parties and UV-reactive decor.
Not for: Anyone who needs true 365 nm UV for scorpion hunting, mineral fluorescence or forensic-style inspection.
GPT 6.1 Sol · November 10, 2026
Feit Electric BPESL13T/BLB
Produces UV-A fluorescence with a standard screw base, making it practical for glow decorations and small-room black-light effects.
Not for: Disinfection, large venues, or ordinary room illumination.
Which one fits you
room-filling glow from a tube fixture
Philips TL-D Blacklight Blue (line)
Filtered BLB fluorescent tubes give even UV-A coverage with little visible violet spill.
Not for: Anyone without a matching fluorescent fixture and ballast.
Check before you buy
Where to find Feit Electric
- Lowe's
- The Home Depot
- Walmart
Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Feit Electric: Common screw-in black light bulbs.
- Philips: TL-D BLB fluorescent tubes.
- Sylvania (Ledvance): Blacklight-blue fluorescent tubes.
What to avoid
- Bulbs that do not state a wavelength
- Staring directly into UV sources for long periods