When making a custom lamp or repairing an old one, bulb heat is in fact something wise to consider when picking a bulb and picking a shade. If the bulb is too close to the shade, it may cause discoloration. Or, it can also cause a fire! I want to give you a few simple tips to avoid this.
Incandescent Bulb 40-60 Watt
Incandescent Bulb that have 40-60 watts are best at a 1-2" distance from the shade.
Incandescent Bulb 75-100 Watt
Incandescent Bulb that have 75-100 watt are best at a 2-3" distance from the shade.
Incandescent Bulb 150+ Watt
Incandescent Bulb that have a 150+ watt are best at a 3-4" distance from the shade.
Compact Fluorescent Bulbs
Compact fluorescent bulbs are cooler so they require less space. You can keep these at a 1-2" distance from the shade.
I try to keep these blogs simple and quick, but with the answers your looking for. If you have any questions, or if I didn't cover something, let me know!