ENGINEERING REFERENCE TOOLS
Glass Engineering Calculator
Use these bench-side tools for early weight, lighting, lens and thermal estimates. Every result shows its inputs and assumptions. Final values must be confirmed against the approved component drawing, glass material and complete luminaire assembly.
Flat Glass Weight Calculator
Estimate the mass of a rectangular glass window or circular disc from nominal dimensions and density.
Mass = volume × density
View custom glass windows →Conical Lamp Shade Weight Estimate
Estimate the side-wall mass of a simple conical or frustum-shaped glass shade. The calculation excludes necks, flanges, ribs, feet and local wall variation.
Approximate volume = frustum side area × wall thickness
View conical glass lamp shades →Beam Diameter and Average Illuminance
Estimate the geometric beam diameter at a target distance and the average illuminance if the transmitted lumens were distributed uniformly inside that circle.
Diameter = 2 × distance × tan(full beam angle ÷ 2)
View custom lighting glass lenses →Spherical Lens Sag Calculator
Calculate the center sag of a spherical surface from clear aperture and radius of curvature. This is a geometry calculation, not a complete optical prescription.
Sag = R − √(R² − (D ÷ 2)²)
View molded glass lenses →Linear Thermal Expansion Estimate
Estimate a dimensional change over a temperature interval using a selected linear expansion coefficient. Use the coefficient from the approved material data for final work.
ΔL = original length × CTE × temperature change
Review glass material selection →Use Calculator Results as Screening Data
Calculated values do not define production tolerance, safe working temperature, pressure resistance, impact rating, photometric performance or certification. Send the component drawing and assembly conditions to info@lampoptics.com for a manufacturing review.