for standard AQ61 (or Altman 360Q) ellipsoidals, consider old border: 1px solid; -->. google_color_link = "0000FF"; conversions: Unit (C/D) D = SQUARE ROOT( (V * V) + (H * H) ) D = X / mf P = D / B F = 2 * ATAN(X / (2 * D) ) TAN(K + F/2) - TAN(K - F/2) ) footcandles = lux / 10.8 Beam angle . } Mohamed Akram Khan says: October 2, 2017 at 5:56 am. distances, H = SQUARE ROOT( (D * D) - (V * V) ) You can usually find this number on the bulb packaging. You can also calculate the savings in the reduction in bulb changes due to the longer bulb life. -- spreadsheet. google_ad_height = 90; degrees = 180 * radians / PI to be the beam spread using the field angle information. If you have any others that would be helpful, email them to us and we'll add them. For information &/or comments, please drop us a line. BL stands for the number of lumens that a light bulb emits. mf = 2 * TAN(F / 2) millimeters = inches * 25.4 mf = X / D google_color_link = "0000FF"; This calculator will determine the annual energy cost savings and life-time energy cost savings when you upgrade bulbs to a newer LED type bulb. H = V * TAN(K) Remember that to get back to these pages, you will have to .table_d2e42 { If you C = focus angle off horizontal, K = focus angle off vertical, RMS Volts = 1.11 x Average Volts F = 2 * Webmaster radians = PI * degrees /180. P = projection magnification meters = feet * 0.3048 To get the number of lumens we multiply the lux requirement from step 1 by the area. -- Reply. V = I * L * (R / 1000) * 1.004 Pattern The following is a collection of math formulas that can prove useful to lighting designers and electricians. the drawing to the right: lighting calculations built into it: In addition to the size of the space, a variety of factors, such as the activities being conducted and wall reflectance can also play a role. Calculate No’s of … google_color_text = "000000"; K = 90 - C. This site is owned & operated by HSTech.org & Scott C. Parker L = length of conductor in feet google_ad_format = "120x600_as"; Watts = Volts * Amps D = H / COS(C) google_color_text = "000000"; Y = V * ( intensities, spreads, and angles: As seen in drop of conductor (cable) of L length browser "File" menu. pattern size to be 3" (size of gate), and old projection size Centigrade = 0.556 * (Fahrenheit - 32) Footcandles = Candlepower / (D * D) Refer to the Credit Page for V = H * TAN(C) You can How many fittings required.Then how to calculate detailed formula required sir. 9 Responses to Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part1) KVM says: October 2, 2017 at 4:59 am . Cunningham at L&E lighting. Lgtcalc1 for Excel'97 (26K) 20 Electrical MS Excel Spreadsheets. Candlepower = width: 100%; Please let me … D = V / SIN(C) Fahrenheit = 1.8 * (Centigrade + 32) We are working on other down load file formats for this H = V / TAN(C) 0.707 x Peak Volts Amps = Watts / Volts In this step we need to work out the area of the kitchen. This page will be updated with shop math that is pertinent to the High School/Small google_ad_type = "text"; V = voltage R = resistance of conductor per 1000 feet F = beam or field angle of fixture C = ATAN(V / H) RMS Volts = diameter of gate (shutter plane opening) for other fixtures. Beam angle google_ad_width = 120; Knowing how many lamps you need to adequately illuminate a room or space can be tricky. Category: Electric Current Power Distribution System Tags: cable calculation formula, cable size formula, cable sizing, how to select cable size, voltage drop. This section is dedicated to tools every electrical engineer can use in daily work. Focus angle off vertical (K): X = D * mf Lumen Estimation Calculator. R for 18awg = 6.51, 16awg = 4.09, 14awg = 2.58 K = 90 - ASIN(V / D) distance, C = 90 - K H = D * SIN(K) google_ad_height = 600; = D * (2 * TAN(F / 2)) Also, if it is a motor load, the voltage drop for motor starting has to be checked. H = D * COS(C) Sine Wave (VAC): google_ad_type = "text"; Once you know how many lumens you need, you can start figuring out how many light bulbs will suffice to illuminate your surface. A = B * projection magnification and required pattern size: K = ASIN(H / D) Click on your selection, then choose "Save As" from your Lighting calculation formula. also the Return on Investment (ROI) of the LED Lamp. Thank you, Eng Parmar. © 1998-2004. R K Veerabhadra Rao says: March 2, 2015 at 12:55 am. A = new pattern size, B = old pattern size, also download a simple spreadsheet that has several useful It has to be less than 15%. Candlepower: Lgtcalc3 for Excel 3.0 (30K) . multiplying factor (mf): D = V / COS(K) google_color_bg = "F0F0F0";