I have recently been trying out, in my Mag 3D (quad-bored with 12x CBP1650's, high-temp KIU socket) the Osram 64633 15V, 150watt bulb ($4.50 each at bulbconnection.com.) This is in direct-drive mode.
Now this is really the opposite of true CPF passion: underdriving a bulb vs. overdriving. What blasphemy! But, at my house, we have some outdoor halogen lights that are rated at 130V, and when underdriven, give a longer bulb life.
The 64633 bulb rates at 5600 bulb lumens. At 13.2volts to the bulb, I calculate that I get an estimated 2327 torch lumens with WA re-rating formulas and a 65% torch/bulb conversion factor. (When it first turns on, it is brighter, such as est. 3155 torch lumens at 14.4V; after running a few minutes, I figure that due to voltage sag of the 1650's, the volts to the bulb drop to about 12 volts, yielding 1667 torch lumens.)
The deal is that it is more yellow than other solutions, such as the Osram 62138 100watt bulb at 13.0 volts. However, I have used the light outside to run in short bursts and the yellow-ish part does not bother me at all. Moreover, you do not have to worry about flashing the bulb at voltages less than 15V. According to the re-rating formulas, the rated average bulb life of 50 hours increases when underdriven, such as 232 hours at 13.2 volts.
Has anyone else tried this bulb? Thoughts?
Thanks!
Now this is really the opposite of true CPF passion: underdriving a bulb vs. overdriving. What blasphemy! But, at my house, we have some outdoor halogen lights that are rated at 130V, and when underdriven, give a longer bulb life.
The 64633 bulb rates at 5600 bulb lumens. At 13.2volts to the bulb, I calculate that I get an estimated 2327 torch lumens with WA re-rating formulas and a 65% torch/bulb conversion factor. (When it first turns on, it is brighter, such as est. 3155 torch lumens at 14.4V; after running a few minutes, I figure that due to voltage sag of the 1650's, the volts to the bulb drop to about 12 volts, yielding 1667 torch lumens.)
The deal is that it is more yellow than other solutions, such as the Osram 62138 100watt bulb at 13.0 volts. However, I have used the light outside to run in short bursts and the yellow-ish part does not bother me at all. Moreover, you do not have to worry about flashing the bulb at voltages less than 15V. According to the re-rating formulas, the rated average bulb life of 50 hours increases when underdriven, such as 232 hours at 13.2 volts.
Has anyone else tried this bulb? Thoughts?
Thanks!