Heat gain from Lighting

[Deweyirl]

Hi all,

If in a room, a lighting design was carried out and the room will contain 4 no, LED luminaries with a total wattage of 80.

My query relates to what would a reasonable figure or percentage be to use as heat gain from the light. Of the 80 watts, how much of it would go into heat?

I am unable to find it in either a CIBSE guide or an Ashrea guide.

Your help would be gratefully welcomed.

 

[itsmoked]

Every last milliwatt will go into heat. Conservation of energy demands it.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[EnergyProfessional]

Note that depending on the type of fixture (i.e. recesssed), a percentage of that can go into the plenum. This will be a coil load, but not a space load.
with today's LED and lower lighting wattage, probably not as important as in the old HID/fluorescent days.

In Trane Trace and other software you have a setting for the type of lighting and how it relates to space vs. plenum.

 

[moideen]

ashrae 90.1-2007 define LPD(lighting power density)space by space method. find the attached