Free Photometric Plans vs. Professional Plans: What's the Real Difference?

Free photometric plans from LED manufacturers are designed to sell fixtures. They use only that manufacturer's product catalog and optimize for product placement rather than for your specific code requirements, site conditions, or project economics. Professional photometric plans are manufacturer-agnostic-built around the project's applicable codes, the site's actual geometry, and the most effective fixture solution regardless of brand. Both models have a legitimate place, and understanding when each one fits your project saves both money and headaches.

How the free plan model works

When you request a lighting plan from a manufacturer or their lighting representative, the process typically works like this: you provide a site plan and basic project details, their design team creates a photometric layout using fixtures from their catalog, and they send you the plan along with a product quote. The turnaround is usually 1-3 business days, and there is no charge for the service.

This is a lead generation model, and it's a smart one. The manufacturer invests a few hours of design time to produce a deliverable that demonstrates how their products perform on your site. If you proceed with their fixtures, the plan paid for itself through the product sale. Companies like LED Lighting Supply, US LED, Jarvis Lighting, and HTM Lighting Solutions all operate some version of this model.

The plans themselves can be quite good. Major manufacturers employ capable lighting designers and use industry-standard software. The calculations are often accurate, and the layouts are professionally formatted. The issue isn't quality of execution-it's alignment of incentive.

The comparison

Factor	Free Manufacturer Plan	Professional Manufacturer-Agnostic Plan
Cost	$0 (tied to product purchase)	$300-$2,500 depending on scope
Fixture selection	One manufacturer's catalog only	Any manufacturer, any fixture
Optimization goal	Demonstrate that manufacturer's products work	Minimize project cost, maximize code compliance
Code compliance documentation	Variable-may include basic compliance info, may not	Full compliance package tailored to your jurisdiction
Deliverables	Layout PDF, sometimes a fixture schedule	Point-by-point grid, fixture schedule, compliance summary, trespass calcs, uniformity analysis
Turnaround	1-3 days (subject to sales queue priority)	3-7 days standard, rush available
Revisions	Available, but requires re-engaging the sales process	Typically 1-2 rounds included in base price
Jurisdiction-specific compliance	Generic-rarely customized to local code overlays	Tailored to specific municipal requirements, dark sky, Title 24, etc.
Professional accountability	None-the plan is a sales tool	Designer stands behind the deliverable
Who it serves	The manufacturer's sales pipeline	Your permit approval and project budget

When a free plan is the right choice

Being straightforward about this matters: free plans are often perfectly adequate, and spending money when you don't need to is waste. A free manufacturer plan is a sensible choice when:

The project is straightforward. Single calculation area (one parking lot, one building exterior), standard municipal code without dark sky overlays or enhanced energy code requirements. The plan doesn't need to navigate complex compliance-it just needs to show that the lot has enough light with reasonable uniformity.

You're already committed to that manufacturer. If the architect specified Brand X fixtures, or the contractor has an existing supply relationship and the bid is built around that product line, getting the manufacturer's plan is efficient. The fixtures on the plan are the fixtures you're buying.

The jurisdiction has minimal submittal requirements. Some building departments accept a basic photometric layout-fixture locations and a few representative foot-candle values-without requiring a full compliance package. In these jurisdictions, a manufacturer's plan may be everything the reviewer needs.

Budget is the absolute priority. If the choice is between a free plan with some risk of revision and spending $500-$1,000 on a professional plan for a simple project, the free plan is often the rational bet-especially for smaller projects where the consequences of a revision cycle are manageable.

None of this is conditional or grudging. The free plan model exists because it delivers real value to a large segment of the market.

When you need a manufacturer-agnostic professional plan

The calculus shifts when the project involves any of the following conditions:

The architect or engineer has already specified fixtures. If the project specification calls for a specific manufacturer's fixtures-or allows substitution from an approved list spanning multiple manufacturers-you can't get a free plan built around those selections. LED Lighting Supply, the largest provider of free plans, states on its website that it does not provide plans for engineers and architects who need a lighting plan without purchasing their fixtures. This is Photometric Bureau's core market: the project team that needs a plan built around their specifications, not a manufacturer's catalog.

The jurisdiction has strict or complex code requirements. Dark sky ordinances requiring BUG rating verification, CCT documentation, and property-line trespass calculations. California Title 24 projects requiring Lighting Power Allowance calculations and NRCC-LTO compliance forms. Municipal overlays that set specific uniformity ratios or maximum illuminance levels. These require compliance documentation that free plans rarely include.

The project has multiple lighting zones with different requirements. A commercial campus with general parking, enhanced-security parking, pedestrian walkways, loading docks, and building perimeter lighting. Each zone has different IES illuminance targets and potentially different code requirements. The coordination between zones-ensuring fixture selections work together without light trespass between areas-requires optimization that goes beyond single-manufacturer product selection.

A previous plan was rejected. If a free plan (or any plan) failed plan review, the revision needs to address the specific deficiencies the reviewer identified. This is usually a compliance documentation issue, not just a layout issue-and it requires a designer who can interpret plan review comments, recalculate, and produce the additional documentation needed to resolve the review.

The property owner wants to minimize total lighting cost. When you're not locked into one manufacturer, the designer can compare fixtures across manufacturers to find the optimal combination of lumen output, distribution, efficacy, and unit cost. The fixture that looks best in one manufacturer's plan may not be the most cost-effective option when you consider the full market.

The hidden cost of a "free" plan that fails review

This is the scenario that catches project teams by surprise. The free plan is submitted. The plan reviewer sends it back with comments: uniformity ratio exceeds the local requirement, light trespass calculations are missing, the compliance summary doesn't address the dark sky overlay, or the calculation grid spacing doesn't meet the reviewer's standard.

Now the cost starts accumulating:

Resubmission fees. Many jurisdictions charge $50-$500 for plan review resubmissions. Some charge the full review fee again.

Schedule delay. Each rejection cycle adds 2-6 weeks to the permit timeline-the revised plan goes back into the review queue, which in busy jurisdictions can be several weeks deep.

Contractor impact. Electrical rough-in is on hold. In a construction project where trades are sequenced, a lighting delay can cascade into drywall, ceiling, and finish trade delays. General contractors notice. Some bill for delay claims.

Rush fees on the professional plan you now need. After one or two rejection cycles, the project team often decides to hire a professional photometric designer-but now under time pressure. Rush turnaround typically adds 25-50% to the standard fee.

A $500 professional plan that passes on first submittal is cheaper than the downstream cost of a free plan that fails twice. The math isn't complicated, but it's invisible until you're in the middle of it.

What to ask any photometric plan provider

Whether you're getting a free plan from a manufacturer or commissioning a professional plan, these questions protect you:

1. What software was used to generate the calculations? AGi32 and DIALux EVO are industry standards. Simplified proprietary tools may not produce the calculation detail that plan reviewers in stricter jurisdictions expect.
2. Are the IES files from the actual specified fixture? Calculations are only as accurate as the photometric data they're based on. Generic or "representative" IES files produce approximate results that may not match installed performance.
3. Does the plan include a point-by-point calculation grid? Not just summary statistics. The grid should show foot-candle values at regular intervals across the entire calculation area, at a spacing acceptable to the plan reviewer.
4. Is a compliance summary included? Ideally, a table or narrative that maps each applicable code requirement to the plan's demonstrated performance. This is what makes a plan permit-ready rather than just informative.
5. Does the plan use maintained lumens, not initial lumens? A Light Loss Factor (LLF) of less than 1.0 should be applied. A plan calculated at LLF = 1.0 overstates performance and may fail review when the reviewer applies the appropriate depreciation factor.
6. Are light trespass calculations included? Foot-candle values at all property boundaries-not just the street frontage. This is increasingly expected even in jurisdictions that don't explicitly require it.

Frequently asked questions

Why do manufacturers give away photometric plans for free?

Because the plan is a customer acquisition tool. The cost of a few hours of design work is a rational investment in converting a project inquiry into a fixture sale. It's the same logic as a custom kitchen design from a cabinet showroom-the design is free because it drives product sales.

Can I use a manufacturer's free plan and substitute different fixtures?

Not reliably. The photometric calculations are based on the specific IES files-light distribution patterns, lumen output, mounting height assumptions-of the manufacturer's fixtures. Substituting a different manufacturer's fixture with different photometric characteristics invalidates the calculations. You'd need a new plan.

Will a free plan be accepted by my plan reviewer?

It depends entirely on your jurisdiction. In municipalities with minimal photometric submittal requirements, a well-executed manufacturer plan passes review routinely. In jurisdictions with dark sky codes, specific uniformity requirements, or enhanced energy code compliance-the plan may lack the documentation the reviewer needs.

What if I already have a free plan but it was rejected?

This is common and fixable. The plan reviewer's comments will indicate specific deficiencies. A professional photometric designer can review the comments, identify what needs to change-additional compliance documentation, layout adjustments, missing calculations-and produce a revised plan that addresses each point. In many cases, the fixture selections from the original plan can be retained if they're appropriate; the issue is usually documentation and optimization, not product selection.

How do I know if my project needs a manufacturer-agnostic plan?

If any of the following apply, a manufacturer-agnostic plan is likely the better investment: your jurisdiction has dark sky ordinances or Title 24 requirements, your architect has already specified fixtures, the project involves multiple lighting zones, or a previous plan was rejected. For simple, single-zone projects in standard jurisdictions, a free manufacturer plan is often sufficient.

If you want to compare project scopes before deciding, review the pricing page.