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There are high power IR-LEDs on the market with 100mW/sr. The average IR-LED has a value of 10 to 15mW/sr.
The LD274-3 has a value of 80mW/sr.
Also increasing the duty cycle will have effect on the range. IR-receivers like to receive bursts, not a steady signal. Produce bursts using a second astable.
Boncuk
P.S. I just checked out Vishay. The TSAL6100 has 130mW/sr, at 100us it has 1000mW/sr.
Thanks for the tip. I need a high power ir-led for an upcoming project.