Adquiered a NEC LT155 projector with bad bulb, decided to try to convert to LED.

Research Shows that even LED's output more Lumens than the original lamps, they seem to be dimmer in the end.

Possible causes:

Filters in front of the LCD chips

Wavelenght of LED Light vs. Wavelenght of original bulb.

Possible solutions:

Tamper with the filters in front of the LCD chips

Higher color temperarture LEDS, like the ones used in aquariums

Research LED wavelebnght vs. bulb wavelenght

Use 3 LED chips, RGB, one for each corresponding LCD