mdocod
Flashaholic
[email protected]=5.28W>84 lumen. ~16 lm/w
at 4.8V, this bulb is really being driven VERY gently. only delivering 16lm/w is an indication that it would have about 1000-2000 hours life at that drive level.
I'm pretty sure krypton bulb re-rate formulas are different than halogen/xenon. Seems I recall reading somewhere that krypton lamps have less extreme responses to changes in voltage. (the exponents are lower in the formulas).
but assuming the regular formulas.
@7.2V it would be @1.375A. 9.9W. Assuming the original lamp life was around 1500 hours, the new lamp life is around 10 hours.
Lumens re-rate to 344,. So torch lumens would be about 223. ~35 Bulb lumen/watt, which is about right for a lamp driven pretty hard..
it could be less than that... I think Mark is on to something with the new gas-fill lamps probably dissipating heat differently than vacuum lamps. Something closer to 3-3.3 probably is more appropriate for the lumen re-rating. Life rerating may be a little less harsh than ^12,
[edit] I'm not sure how you came up with 425 lumens, must have made an error
at 4.8V, this bulb is really being driven VERY gently. only delivering 16lm/w is an indication that it would have about 1000-2000 hours life at that drive level.
I'm pretty sure krypton bulb re-rate formulas are different than halogen/xenon. Seems I recall reading somewhere that krypton lamps have less extreme responses to changes in voltage. (the exponents are lower in the formulas).
but assuming the regular formulas.
@7.2V it would be @1.375A. 9.9W. Assuming the original lamp life was around 1500 hours, the new lamp life is around 10 hours.
Lumens re-rate to 344,. So torch lumens would be about 223. ~35 Bulb lumen/watt, which is about right for a lamp driven pretty hard..
it could be less than that... I think Mark is on to something with the new gas-fill lamps probably dissipating heat differently than vacuum lamps. Something closer to 3-3.3 probably is more appropriate for the lumen re-rating. Life rerating may be a little less harsh than ^12,
[edit] I'm not sure how you came up with 425 lumens, must have made an error
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