If the chip is efficient enough and you have four bulbs in each room thats 240w worth of mining
Your bulbs do not emit light?
If they do emit light, what portion of that 60W goes to the lighting solution? What is the lighting solution? How much waste energy (read: heat) does the lighting solution + the mining solution produce? What cooling is required to prevent both the mining and the lighting solution from failing?
LED, for 'white' lighting, is already one of the most efficient forms, and a '60W equivalent' bulb puts out a decent amount of heat; those bulbs aren't primarily heat sinks just because it looks groovy. Add another 60W in mining power to that, and you most definitely have to cool things actively, if not to keep the mining chip from overheating and throwing out error after error (if not plain dying), then certainly to keep the LED emitter's phosphor from degrading and/or the LED emitter itself from releasing the magic smoke.
Can it be done? Sure. Does it make sense? Nah.
Well the active cooling shouldn't be an issue when placed below an active fan and with led bulbs at 6-11 (most around 8.5w) and the standard american bulb socket allowing atleast 60w we have 51.5w to play with, this can be 48w of pure hashing power and the rest as wiggle room, with heat dissipation from the large fan above it.