if the wattage is equal then the heat out put will be equal
but the heat will be 1 of 2 types convection heat or infrared....
convection: the heat the light bulb gives off heating the air around it.
infrared: the heat given off that is directional and is sensed on surfaces and not the air. if a infrared light is pointed at a object that object will increase in temperature give off heat and heat the air around it.
a light buld is just light buld .red , clear , frosted ect
is made the same mainly to produce light and not heat there
are better bulbs to use if you want heat. but if a light buld is used a aluminum reflector sholud be used to direct the heat.
a spot or flood light is a little better idea it has a built in reflector and does a better job of directing its heat, but is still made to give off mainly light
a heat lamp is a light buld the is designed to put off heat and light the red heat lamp we all know about puts off a great deal of infrared heat with less light so it becomes a good choice to keep warm by but a poor choice to read by...
heat lamps also come in white or clear but its infrared heat is reduced slightly to produce a better light
wow sorry that got long winded...
can you tell what i do for a living...