Pages: 1 ... 7 8 [9]   Go Down

Author Topic: Colour of light matters  (Read 20592 times)

Iliah

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 701
Re: Colour of light matters
« Reply #160 on: July 12, 2013, 03:06:42 PM »

Before you leave, is my point with FL lights clear?
Logged

xpatUSA

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 364
    • Blog
Re: Colour of light matters
« Reply #161 on: July 12, 2013, 03:37:01 PM »

Before you leave, is my point with FL lights clear?

My understanding is that you're telling the forum that setting the shutter period to more than the flicker rate of the lamps is bad practice.

TTFN,
Logged
best regards,

Ted

Iliah

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 701
Re: Colour of light matters
« Reply #162 on: July 12, 2013, 03:39:15 PM »

One can use 1/30 (not always practical), 1/60 (may be too long as well), or 1/120.
Logged

xpatUSA

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 364
    • Blog
Re: Colour of light matters
« Reply #163 on: July 12, 2013, 05:38:24 PM »

One can use 1/30 (not always practical), 1/60 (may be too long as well), or 1/120.

Indeed one could. You said "FL lights". Would your advice apply also to modern lamps with electronic ballasts?

From Wikipedia:
Quote
Fluorescent lamps using high-frequency electronic ballasts do not produce visible light flicker, since above about 5 kHz, the excited electron state half-life is longer than a half cycle [citation needed], and light production becomes continuous. Operating frequencies of electronic ballasts are selected to avoid interference with infrared remote controls. Poor quality (or failing) electronic ballasts may have insufficient reservoir capacitance or have poor regulation, thereby producing considerable 100/120 Hz modulation of the light.

(my bolds)
« Last Edit: July 12, 2013, 05:42:35 PM by xpatUSA »
Logged
best regards,

Ted

Iliah

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 701
Re: Colour of light matters
« Reply #164 on: July 13, 2013, 01:46:36 AM »

> Would your advice apply also to modern lamps with electronic ballasts?

If one can't check the lamps operate at high freq. - yes.
Logged
Pages: 1 ... 7 8 [9]   Go Up