Vintage Inter-World 15w Fluorescent Desk Lamp Lit with Various Lamps

Here is my vintage 1980s Inter-World single F15T8 fluorescent desk lamp lit up with four different F15T8 and F15T12 lamps:

- GE F15T8/CW halophosphate cool white 4200K
- GE F15T8/RVL Reveal 2600K
- GE F15T8/SPX50 tri-phosphor 850 5000K
- GE F15T12/WW halophosphate warm white 3000K