Dichroic coatings

Long & Short Wave Separation Filters

Cold mirror filters reflect the visible light at a specified incidence of angle normally at 45° while transmitting the heat or infrared lightwaves to an area not effected or as a bounce to a ellipsoidal reflector of 180° or where the heat is present.

Hot mirror filters work the opposite way. Normally 0° transmitting the visible lightwaves rejecting the infrared back to the source. The Hot mirror can also be directed up to 22° to reject the heat in another direction for fixture cooling.

Combination IR/UV hot mirror filters are achieved by coating both surfaces of the substrate. We reject both long and short wavelengths. Combination coatings can also be used for creating narrow band pass filters such as UV transmitting blacklight and infrared filters used for CCD surveillance and covert operations. Combination coatings can also be used for attenuation and for color stacking (color rendition of a doubled polyester filter).

How To Specify And Order Dichroic Color Filters Consider the following about your specific application: 1) Is this a permanent Installation? If yes, will the colors be changed out periodically? If yes, is there easy access? 2) Is it an indoor or outdoor installation? 3) What is the lamp size and type? 4) What is the beam angle? (This is vital information when specifying a Dichroic) 5) How long will the filter be exposed to the light source, 5 minutes, eight hours, continuously? 6) How critical is color uniformity? 7) How often do you want to change out the filter? 8) Does your budget allow for regular maintenance? 9) Are you in need of custom colors? These are some key questions that should be answered before deciding which color media is best for your application. Now that we have created a list of questions and answers, lets see if a dichroic fits your needs. Dichroics are being used in applications ranging from 25.4mm diameter filters used in an intelligent luminare to fountain fixtures submerged in water up to 24" diameter used in search lights. Dichroic color filters have many fundamental assets such as greater light output therefore allowing you to cut back on the lamp size or de-rate the operation of the source. If you could reduce the lamp size from 1000w to a 750w lamp and you had 50 units you would reduce your power consumption by 1250 amps or 12,500 watts. You decide what to do with the extra power.

DICHROIC COLOR FILTERS vs.
CONVENTIONAL POLYESTER COLOR FILTERS
Based On Polyester Color Performance Using 1K Par Lamp At Full

Lamp Type: FFP Narrow 1K Par. Average Life: 800 Hrs Color Polyester: Deep Or Dark Blue Average Life Before Fading: 10 - 15 Hrs. Cost Of Polyester Per 15 Hrs Use. $ 1.23 Number Of Times Polyester Filter Is Changed Per Lamp Life 54: 54 X 1.23 = $ 66.42	Average Man Hrs. Per Change .25 X 54 ======= Total Man Hrs . 13.50 Hrs.
" General Theory Of De-rated Operation Of Source " 120 V Lamp @ 110 V = 90% Of Operation Voltage Or - 10%
Results: = 80% Input Wattage 77% Output Wattage	Sttv Lamp * Approx. 200% Extended Lamp Life -100° Kelvin (Color Shift)

*Note: Lamp Life May Vary, Tungsten Halogen And Incandescent Lamps

Can See Up To 300% In Extended Lamp Life When De-rated.

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