DIALux calculations for lighting distributors: six delivery options compared

The real decision is how the distributor will deliver consistently

A distributor can have a strong catalogue, competitive pricing and a responsive sales team, then lose momentum when a client asks for a product-specific lighting calculation. At that point the job needs more than a bright rendering: somebody must interpret the drawings, select the correct product variant, use its photometric data, create the relevant calculation surfaces and return results in time for the commercial decision.

There are several legitimate ways to get that work done. The right choice depends on enquiry volume, project complexity, deadline, internal capability, local responsibility and how much control the distributor needs over revisions. The comparison below is not a ranking. It shows what each option does well, where its pain points normally appear and what a distributor should put in place before relying on it.

One commercial difference deserves to be visible from the start: LUXGRID's defined LUX CHECK route is US$15 through 21 October 2026. For an eligible single-area validation of a supplied layout, that gives a distributor a low-cost way to obtain a product-specific DIALux check without immediately taking on permanent staff cost or an open-ended consultancy appointment.

Option 1: employ an in-house lighting designer

A dedicated employee gives the distributor close control over priorities, product knowledge and communication with the sales team. The designer can learn the catalogue in depth, build reusable product libraries and respond quickly when the pipeline is steady. For distributors with continuous calculation demand, complex technical sales or several branches, this can be the strongest long-term arrangement.

The pain points are fixed employment cost, recruitment, training, software and hardware, quality supervision and continuity when one key person is unavailable. Demand is rarely perfectly even: the designer may be underused in a quiet month and overloaded during tender deadlines. A single in-house specialist can also become a bottleneck when warehouse, office, road and sports projects arrive together, because those applications do not all use the same modelling logic.

Option 2: make the salesperson or application engineer calculate

Technical salespeople already understand the opportunity, client history and products being proposed. For a simple repeat layout, a trained team member using a controlled template can give an early answer without a separate handover. That proximity can be valuable when the calculation is genuinely small and the assumptions are already clear.

The hidden cost is that calculation time replaces selling time. Urgent quotations encourage shortcuts, while skill and documentation quality may vary between team members. Product selection can also become circular: the person trying to close the sale may be asked to independently check whether the chosen layout is technically suitable. Without a review step, the distributor may end up with fast output that is difficult to explain, revise or defend when the consultant asks how the result was produced.

Option 3: request support from the manufacturer or regional office

Manufacturer support can bring authoritative product knowledge, verified photometric data and direct access to specialist product teams. It is particularly useful for unusual optics, control behaviour, product limitations or strategic projects where the factory needs to confirm exactly which configuration is being offered.

The distributor may have limited control over the queue, turnaround, revision priority and report format, especially when the same regional team supports many markets. Time-zone and communication layers can slow a tender response. Head-office support may also be designed for selected projects rather than every local enquiry, and it naturally stays within that manufacturer's own range. This option works best when the distributor agrees which opportunities qualify, what information must be submitted and who owns later revisions.

Option 4: leave the calculation to the project consultant

The appointed lighting, electrical or MEP consultant may be the right party when the calculation is part of a wider professional design appointment. The consultant can coordinate local criteria, electrical work, architecture, authority requirements and other disciplines in a way that a product supplier should not pretend to replace.

However, consultant design is not automatically distributor sales support. The consultant may need to remain product-neutral, may work to a different programme or may expect the supplier to submit product-specific evidence for review. If the distributor waits for the consultant to test every product option, it can lose the chance to demonstrate a proposal early. A distributor calculation and a consultant's formal design have different roles: one can support product selection, while responsibility for compliance and approval stays with the appointed project parties.

Option 5: hire freelancers or ad-hoc calculation providers

Freelance support offers flexible capacity without a permanent payroll commitment. It can be effective when the distributor has a vetted individual, a clear brief and occasional projects that match that person's expertise. Marketplaces also make it easy to find somebody quickly when the internal team is already busy.

The pain points are consistency, availability, confidentiality, product-file control and responsibility for revisions. A low initial price can expand when modelling assumptions were not agreed, the drawing changes or the report needs to be rebuilt for client review. If different people handle each enquiry, the distributor repeatedly explains its catalogue, naming system and preferred output. The real comparison is therefore not only the first quoted fee; it is the total coordination time and whether the same quality can be repeated across the next ten projects.

Option 6: use a quick calculator, template or automated estimate

A lumen-method calculator, spacing rule or standard room template is useful for an early quantity sense-check. It can help a salesperson test whether a proposal is broadly plausible before requesting detailed work, and it is often the fastest option when dimensions and product details are still provisional.

Its limit is the question it can answer. A simple calculator may not represent the real light distribution, obstructions, racking faces, task areas, road profile, floodlight aiming, glare, spill or emergency route. DIALux itself can automate parts of placement, but a useful project still depends on the correct geometry, real luminaire data, calculation objects and evaluation criteria. A quick estimate should therefore be labelled as preliminary and should not be presented as a calibrated project calculation or a guarantee of installed performance.

What distributors should compare before choosing any option

Compare response time, technical capability, product-data control, revision capacity, report clarity, confidentiality, communication and total cost per completed enquiry. Then test the workflow with the situations that usually cause pressure: a missing IES file, several optics under one family name, an incomplete plan, a next-day tender, a consultant comment and a product substitution after the first issue.

Also decide where the service begins and ends. The calculation provider can model the agreed information and document results, but the distributor must confirm the exact product offered and supply authentic IES, LDT or GLDF data. Site verification, local compliance, electrical and structural design, product certification and formal approval remain with the responsible project parties. Clear boundaries prevent a useful sales calculation from being mistaken for an unlimited professional appointment.

Why the US$15 LUX CHECK changes the commercial decision

The other options carry costs that are not always visible on a quotation: salary and training for an in-house designer, lost selling time for a salesperson, waiting time for regional support, professional fees for a wider consultant appointment, or repeated briefing and revision charges with ad-hoc providers. LUXGRID's US$15 LUX CHECK gives eligible distributor enquiries a clear master price for a clearly defined calculation task.

The standard scope is intended for a single-area validation where the distributor already knows the X by Y luminaire arrangement it wants checked and can provide the necessary geometry and exact photometric file. USD is the fixed master currency, while local-currency displays are only daily exchange-rate equivalents. This makes the first commercial decision easy to understand: the distributor knows the base price before committing internal time to the calculation route.

US$15 does not mean every possible DIALux project has the same scope. Multi-area modelling, layout development, several alternatives, advanced checks, extensive client-ready documentation, extra revisions or urgent delivery may require a separate quotation. Keeping that boundary clear protects the value of the US$15 service instead of promising an unlimited project under a headline price.

For a distributor considering a longer relationship, the low entry price also creates a practical first test. The team can assess LUXGRID's product-file handling, communication, calculation output and revision process on a real eligible enquiry before discussing recurring volume, priority handling or a brand partnership.

How the LUXGRID distributor workflow closes the combined gaps

LUXGRID is designed as a dedicated external calculation partner rather than an occasional source of drawings. The US$15 LUX CHECK provides the accessible entry point for an eligible validation, while separately scoped work supports projects that need more modelling or reporting. Together, this gives a distributor access to specialist DIALux capacity without requiring a full-time calculation payroll, while a repeat relationship provides more continuity than restarting with a new ad-hoc provider for every enquiry. The sales team keeps ownership of the customer and product offer; LUXGRID concentrates on the agreed modelling, calculation and report work.

The workflow starts with product control. A brand or authorised distributor provides its current catalogue, exact model naming, specification sheets and authentic IES, LDT or GLDF files. DIALux's own guidance emphasises planning with real luminaires and product data; that principle is especially important for a distributor because wattage or lumen output alone does not describe the optic. Organising verified files once reduces repeated searching and helps each new project begin from the intended product variant.

Next comes a structured project brief: drawings, dimensions, mounting information, area use, target criteria, preferred products, required outputs, deadline and expected revision route. Missing inputs are identified before detailed work proceeds. This protects turnaround because uncertainty is visible early, and it protects the distributor because assumptions can be recorded instead of silently becoming apparent facts.

Finally, scope, price and deliverables are agreed around the actual job. A small validation check does not need the same workflow as a multi-zone warehouse, road scheme or football field. Repeat distributors can discuss a longer-term arrangement covering file onboarding, project intake, priority, revision allowances and reporting expectations. Any logo display, co-marketing or branded presentation is used only with appropriate permission.

This combination addresses the main operational pain points: scalable capacity, consistent handling, product-specific photometry, controlled handovers, reviewable results and a clear path for revisions. It does not promise that every layout will pass, that every tender will be won or that an authority will approve the project. It gives the distributor a disciplined way to discover problems before supply and to present a stronger, more transparent product proposal.