I have 100 W halogen lamp and need to adjust the intensity to 1000W/m2 (or 1.5 AM solar light spectrum), any of you know the equation or if you have any reference paper please share with me.
for more simplicity use 1000 w halogen lamp to get 1000w/m2 or use your lamp on a 1/10 of area i.e 100w /0.1 m2 is equevelent to 1000w/m2 any way , then use a dimmer swich connected in series with your lamp and varying it to get from 0 to 1000 w/m2. furthermore , you can have a look to my publications i use this idea and it worked greatly.
I think that you have to make measurements with a pyranometer in order to see what amount of energy reaches to the receiver. The measurements have to be made in various positions and after this, a numerical integration over all the surface.
Similar to what Yasser E Abueldahab said use 100W halogen lights keeping them close enough.. You can use a dimmer switch to regulate the output light intensity as per the requirement. Make sure you provide proper ventilation as tremendous amount of heat will be produced resulting in frequent replacement of bulbs.
Even though you can adjust the total irradiance to match the desired 1 sun, the spectral intensity of what a lamp can deliver is way different from the actual AM1.5 reference spectrum...
Beside the power intensity ( 1000W/m2), the spectral intensity (energy distribuatiion in different wavelength) should also be considered in order to comply AM1.5. You need to use optical filters to realize it.