Is it safe to screw in a Philips Agro-lite 75 watt bulb/120 v into a table lamp? Lamp is rated for 100 watt normal everyday light bulb .
I'm not sure about the electrical safety. I'd just play it safe with a 100w, or get a more powerful lamp. You can up the light by surrounding the seedlings with aluminum foil.
Yes. As long as you use the same or a lower wattage than the rating you are good. You just cannot go up in wattage.
Oh, and the light bases must be the same. (The screw in part.)