The color of the light bulb might affect the
temperature around it slightly, but it's more
complicated than that. It turns out that power
and efficiency affect the temperature much more
The power of the light bulb is a number in
watts (W) or kilowatts (kW) that tells youhow
much electricity the bulb needs. Some of that
electricity gets turned into light, and some of
it gets turned into heat. The efficiency of
the light bulb tells you how much. For example,
a 5%-efficient bulb turns 5% of its electric
energy into light and the rest (95%) into heat.
Together, power and efficiency tell you how
much light and heat are generated. High
power, high efficiency light bulbs generate the
most light intensity. High power, low efficiency
light bulbs generate the most heat.
So what about color? Different colors of
light have different amounts of energy. From
lowest energy to highest energy, the order is:
red, orange, yellow, green, blue, and
violet. But this only matters if you're
comparing light sources with the same intensity.
Also, this light only turns into heat when a
surface absorbs it. Since the goal of the
light bulb is to radiate light to the whole room,
ideally the light bulb will not absorb too much of
its own light.