Film-Tech Forum ARCHIVE: power chart for xenon bulbs?????

This is topic power chart for xenon bulbs????? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Dan Lyons (Member # 1454) on 05-08-2004, 01:04 PM:

Is there such a thing? I need to know what range of amps to run my Osram XBO 700w/hs at; the box doesn't tell me. I've been running at 29 amps, not sure if that's too low.

danny

Posted by Darryl Spicer (Member # 711) on 05-08-2004, 01:17 PM:

its volts X amps = wattage

24DCV
X
29AMPS
=
696 Watts

If your DCV is running to low the 29 amps when multiplied with that number will not add up to the desired wattage of the bulb.

Posted by Dan Lyons (Member # 1454) on 05-08-2004, 01:33 PM:

nifty formula, thanks! [thumbsup]

danny

Posted by Gordon McLeod (Member # 33) on 05-08-2004, 01:44 PM:

actaually it is va not watts.
wattage is a unit of power and volts x amps would be true for DC but not ac for ac it is volts x amps x powerfactor this becomes an issue with reactive loads such as motors

Posted by Gordon Bachlund (Member # 124) on 05-08-2004, 02:51 PM:

Dan, welcome to the wonderful world of Ohm's Law, DC and AC equipment and machinery, single- and poly-phase circuits, and similar high power intellectual pursuits. [Smile]

Posted by Adam Martin (Member # 641) on 05-08-2004, 05:19 PM:

According to this document from Osram, the lamp should operate optimally at 18 volts and 37 amps (range of 30-45 amps).

Posted by Phil Hill (Member # 371) on 05-09-2004, 03:41 PM:

Actually Gord M, since in a dc circuit the pf=1, watts would still be correct. [Razz]

>>> Phil

Posted by Gordon McLeod (Member # 33) on 05-09-2004, 03:51 PM:

exactly the formula still has PF in it just in the case of DC it is 1 but an important factor to remember in AC issues especially around motors and transformers

Posted by Phil Hill (Member # 371) on 05-09-2004, 04:08 PM:

You're right McGord, I *ALWAYS* think about power factor whenever I walk by a motor or transformer...or even a capacitor.

Am I over "reactance-ing"?

Sorry, I don't have more "resistance" to such a lame pun. [Razz]

>>> Phil